* src/tgba/tgbagraph.hh: Automatize the setting of the SingleAccSet
property.
* src/tgbaalgos/minimize.cc: Do not bother setting SingleAccSet.
* src/tgba/sba.hh: Delete.
* src/tgba/Makefile.am, wrap/python/spot.i: Adjust.
* src/taalgos/tgba2ta.cc: Do not include sba.hh.
* src/neverparse/neverclaimparse.yy: Set the SBA property on the output.
* src/tgbaalgos/lbtt.cc (lbtt_read_gba): Set the StateBasedAcc property
on output.
* src/tgbaalgos/dotty.cc, src/tgbaalgos/neverclaim.cc: Do not rely on
the sba interface.
* src/dstarparse/dra2ba.cc, src/dstarparse/nra2nba.cc,
src/tgbaalgos/simulation.cc, src/tgbaalgos/sccfilter.cc: Set
tgba_digraph::StateBasedAcc as appropriate.
* src/tgbatest/ltl2tgba.cc: Add extra assert.

* src/saba/sabacomplementtgba.cc, src/saba/sabacomplementtgba.hh,
src/tgba/tgbatba.cc, src/tgba/tgbatba.hh, src/tgbaalgos/degen.hh,
src/tgbatest/complementation.cc, src/tgbatest/ltl2tgba.cc: Here.

* src/ltlvisit/destroy.cc, src/ltlvisit/destroy.hh,
src/ltlvisit/reduce.cc, src/ltlvisit/reduce.hh: Delete.
* src/ltlvisit/Makefile.am: Adjust.
* src/ltlvisit/clone.cc, src/ltlvisit/clone.hh (clone): Remove.
* src/ltlvisit/contain.hh (reduce_tau03): Remove.

* src/tgba/tgbaexplicit.cc, src/tgba/tgbaexplicit.hh: Delete.
* src/tgba/Makefile.am: Adjust.
* src/tgbaalgos/reductgba_sim.cc, src/tgbaalgos/reductgba_sim.hh:
Delete these obsoleted algorithms.
* src/tgbaalgos/Makefile.am: Adjust.
* src/tgbatest/explicit.cc, src/tgbatest/explicit.test,
src/tgbatest/explicit2.cc, src/tgbatest/explicit2.test,
src/tgbatest/explicit3.cc, src/tgbatest/explicit3.test:
Delete.
* src/tgbatest/Makefile.am: Adjust.
* src/bin/ltl2tgba.cc, src/priv/countstates.cc,
src/tgbaalgos/isweakscc.cc, src/tgbaalgos/lbtt.cc,
src/tgbaalgos/ltl2tgba_fm.cc, src/tgbaalgos/minimize.cc,
src/tgbaalgos/minimize.hh, src/tgbaalgos/powerset.cc,
src/tgbaalgos/powerset.hh, src/tgbaalgos/sccfilter.cc,
src/tgbaalgos/sccfilter.hh, src/tgbaalgos/simulation.cc,
src/tgbatest/explprod.cc, src/tgbatest/ltl2tgba.cc,
src/tgbatest/powerset.cc, src/tgbatest/tgbaread.cc,
src/tgbatest/tripprod.cc, wrap/python/ajax/spot.in,
wrap/python/spot.i: Remove all remaining references to
tgba_explicit.

This is a huge patch.  tgba_digraph are equiped with some boolean
properties that can be used to indicate whether they represent SBA
(and will carry more informations later).  All algorithms that produce
or use sba_explicit_* automata are changed to use tgba_digraph.
postproc has been rewritten using only tgba_digraph, and this required
changing the return types of many algorithms from tgba* to
tgba_digraph*.

* src/bin/dstar2tgba.cc, src/bin/ltlfilt.cc, src/dstarparse/dra2ba.cc,
src/dstarparse/dstar2tgba.cc, src/dstarparse/nra2nba.cc,
src/dstarparse/nsa2tgba.cc, src/dstarparse/public.hh,
src/tgba/tgbagraph.hh, src/tgba/tgbasafracomplement.cc,
src/tgbaalgos/compsusp.cc, src/tgbaalgos/compsusp.hh,
src/tgbaalgos/degen.cc, src/tgbaalgos/degen.hh,
src/tgbaalgos/dotty.cc, src/tgbaalgos/minimize.cc,
src/tgbaalgos/minimize.hh, src/tgbaalgos/postproc.cc,
src/tgbaalgos/postproc.hh, src/tgbaalgos/sccfilter.cc,
src/tgbaalgos/sccinfo.cc, src/tgbaalgos/stripacc.cc,
src/tgbaalgos/stripacc.hh, src/tgbaalgos/translate.cc,
src/tgbaalgos/translate.hh, src/tgbatest/ltl2tgba.cc,
wrap/python/spot.i: Update.

* src/tgbaalgos/sccfilter.cc, src/tgbaalgos/sccfilter.hh: Rewrite all
composable filters in a way that allow arguments to be passed.
(scc_filter_susp): New function.
* src/tgbaalgos/sccinfo.cc, src/tgbaalgos/sccinfo.hh (scc_ap_support):
New method.
* src/tgbaalgos/compsusp.cc: Adjust to use tgba_digraph, and
call the new scc_filter_susp().

This can only cause failure when running under valgrind (i.e., in the
test suite), but is not a problem in practice as the test is certain
to fail the entry->c check whenever entry->b is uninitialized.

* src/bddop.c (bdd_implies): Here.

Those cannot work now that automata are not labeled by formulas
anymore.

* src/tgbaalgos/isweakscc.cc, src/tgbaalgos/isweakscc.hh
(is_syntactic_weak_scc, is_syntactic_terminal_scc): Remove.

* src/tgbaalgos/dtgbacomp.cc, src/tgbaalgos/dtgbacomp.hh: Rewrite.
Also prefer simple loops over reachiter.
* src/tgbatest/det.test: Adjust.

* src/tgbaalgos/complete.cc, src/tgbaalgos/complete.hh
(tgba_complete_here): New method for tgba_digraph.
(tgba_complete): Rewrite using dupexp and the above.

* src/misc/common.hh (SPOT_RETURN): New macro.
* src/tgba/tgbagraph.hh (out, states, transitions): Use it.

The conversion is not complete, because the conversion from SERE to DRA
used for the closure operator is still building a tgba_explicit_formula.

* src/tgbaalgos/ltl2tgba_fm.cc, src/tgbaalgos/ltl2tgba_fm.hh: Return
a tgba_digraph.
* src/priv/acccompl.cc: Simplify.
* src/graph/ngraph.hh: Add a way to iterate over all names.
* src/tgba/tgbagraph.hh (compute_support_conditions): Return something
useful.  It's actually used by the constructor of testing automata.
* src/tgbatest/wdba.test: Adjust to the fact that state are not
labeled by formulas anymore.
* src/bin/ltl2tgba.cc, src/bin/ltl2tgta.cc: Do not try to enable
UTF8 on automata anymore.

* src/dstarparse/dra2ba.cc: Use tgba_digraph instead of
tgba_explicit_number.
* src/tgbatest/dstar.test: Adjust.

* src/dstarparse/nra2nba.cc: Produce tgba_digraph instead
of tgba_explicit_number.
* src/tgbaalgos/sccinfo.hh (is_useful_state): Make sure
it is reachable.

* src/priv/accmap.hh (acc_mapper_consecutive_int): New class.
* src/dstarparse/nsa2tgba.cc: Build a tgba_digraph, and simplify
using acc_mapper_consecutive_int.

* src/dstarparse/dstarparse.yy, src/dstarparse/public.hh: Adjust the
parser to build a tgba_digraph.
* src/dstarparse/dra2ba.cc, src/dstarparse/nra2nba.cc,
src/dstarparse/nsa2tgba.cc: Temporarily adjust these functions to the
new type until they are rewritten.

* src/neverparse/neverclaimparse.yy, src/neverparse/public.hh,
src/tgbatest/ltl2tgba.cc, src/tgbatest/neverclaimread.test: Adjust.

* src/tgba/tgbagraph.hh: Store the number of the initial state, not a
pointer to it, because if the state vector is reallocated due to some
later calls to new_state(), this pointer will be invalid.
* src/graphtest/tgbagraph.cc, src/graphtest/tgbagraph.test: Test
for this.

* HACKING: Adjust requirements.  g++4.8 is now OK
for all our targets.
* iface/dve2/dve2.cc, src/dstarparse/dstarparse.yy
src/dstarparse/nsa2tgba.cc, src/graph/ngraph.hh,
src/ltlast/atomic_prop.cc, src/ltlast/binop.cc, src/ltlast/bunop.cc,
src/ltlast/multop.cc, src/ltlast/unop.cc, src/ltlvisit/mark.cc,
src/ltlvisit/relabel.cc, src/taalgos/emptinessta.cc,
src/taalgos/tgba2ta.cc, src/tgba/tgbaexplicit.hh, src/tgba/tgbagraph.hh,
src/tgba/tgbasafracomplement.cc, src/tgba/tgbatba.cc,
src/tgbaalgos/cycles.cc, src/tgbaalgos/degen.cc,
src/tgbaalgos/dtbasat.cc, src/tgbaalgos/dtgbasat.cc,
src/tgbaalgos/emptiness.cc, src/tgbaalgos/gtec/gtec.cc,
src/tgbaalgos/ltl2tgba_fm.cc, src/tgbaalgos/magic.cc,
src/tgbaalgos/ndfs_result.hxx, src/tgbaalgos/reachiter.cc,
src/tgbaalgos/scc.cc, src/tgbaalgos/sccfilter.cc, src/tgbaalgos/se05.cc,
src/tgbaalgos/simulation.cc, src/tgbaalgos/tau03.cc,
src/tgbaalgos/tau03opt.cc, src/tgbaalgos/weight.cc: Use emplace()
instead of insert(make_pair(...)) or insert(...::value_type(...)).

These were used in old experiments, but have not turned useful in
practice.  Not worth keeping and maintaining.

* src/tgbaalgos/cutscc.cc, src/tgbaalgos/cutscc.hh: Delete.
* bench/scc-stats/, bench/split-product/: Delete.
* configure.ac, src/tgbaalgos/Makefile.am, README, bench/Makefile.am:
Adjust.

* src/tgba/tgbagraph.hh (new_state, new_states, new_transitions, out,
trans_data): Delegate these useful graph methods so we do not have to
call get_graph().
* src/graphtest/tgbagraph.cc, src/tgbaalgos/dtbasat.cc,
src/tgbaalgos/dtgbasat.cc, src/tgbaalgos/dupexp.cc,
src/tgbaalgos/emptiness.cc, src/tgbaalgos/lbtt.cc,
src/tgbaalgos/powerset.cc, src/tgbaalgos/randomgraph.cc,
src/tgbaalgos/sccfilter.cc,
src/tgbaalgos/sccinfo.cc,src/tgbaalgos/simulation.cc: Simplify.

These were only used by the BDD-based implementation of TGBA, which has
been removed.

* src/tgba/bdddict.cc, src/tgba/bdddict.hh, src/tgba/bddprint.cc: Remove
support for now/next variables.

This translator algorithm is seldom used in practice because we work
with explicit automata everywhere, and this is only useful to build
symbolic automata.  Furthermore, the symbolic automata produced by this
algorithm are larger (when looked at explicitly) than those produced by
ltl2tgba_fm or other explicit translators.

The nice side effect of this removal is that we can also remove a lot of
supporting classes, that were relying a lot on BDDs.

* src/tgba/public.hh, src/tgba/statebdd.cc, src/tgba/statebdd.hh,
src/tgba/succiterconcrete.cc, src/tgba/succiterconcrete.hh,
src/tgba/tgbabddconcrete.cc, src/tgba/tgbabddconcrete.hh,
src/tgba/tgbabddconcretefactory.cc, src/tgba/tgbabddconcretefactory.hh,
src/tgba/tgbabddconcreteproduct.cc, src/tgba/tgbabddconcreteproduct.hh,
src/tgba/tgbabddcoredata.cc, src/tgba/tgbabddcoredata.hh,
src/tgba/tgbabddfactory.hh, src/tgbaalgos/ltl2tgba_lacim.cc,
src/tgbaalgos/ltl2tgba_lacim.hh, src/tgbatest/bddprod.test,
src/tgbatest/mixprod.cc, src/tgbatest/mixprod.test: Delete all these
files.
* bench/ltlcounter/Makefile.am, bench/ltlcounter/README,
bench/ltlcounter/plot.gnu, bench/ltlcounter/run, src/tgba/Makefile.am,
src/tgbaalgos/Makefile.am, src/tgbatest/Makefile.am,
src/tgbatest/cycles.test, src/tgbatest/dupexp.test,
src/tgbatest/emptchk.test, src/tgbatest/ltl2tgba.cc,
src/tgbatest/ltl2tgba.test, src/tgbatest/ltlcross.test,
src/tgbatest/ltlprod.cc, src/tgbatest/spotlbtt.test,
src/tgbatest/wdba.test, src/tgbatest/wdba2.test,
src/tgba/tgbaexplicit.hh, wrap/python/ajax/ltl2tgba.html,
wrap/python/ajax/spot.in, wrap/python/spot.i,
wrap/python/tests/interdep.py, wrap/python/tests/ltl2tgba.py,
wrap/python/tests/ltl2tgba.test: Adjust.

* src/tgbaalgos/powerset.cc, src/tgbaalgos/powerset.hh:
Use tgba_digraph.
* src/tgba/tgbagraph.hh: Improve interface.
* src/tgbaalgos/minimize.cc, src/tgbatest/powerset.cc: Adjust.

This was only used in ELTL stuff, which I just removed because it was
unused.

* src/ltlast/automatop.cc, src/ltlast/automatop.hh,
src/ltlast/formula_tree.cc, src/ltlast/formula_tree.hh,
src/ltlast/nfa.cc, src/ltlast/nfa.hh: Delete.
* src/ltlast/Makefile.am: Adjust.
* src/ltlast/allnodes.hh, src/ltlast/formula.hh, src/ltlast/predecl.hh,
src/ltlast/visitor.hh, src/ltltest/equals.cc, src/ltltest/ltlrel.cc,
src/ltltest/reduc.cc, src/ltlvisit/clone.cc, src/ltlvisit/clone.hh,
src/ltlvisit/dotty.cc, src/ltlvisit/lbt.cc, src/ltlvisit/mark.cc,
src/ltlvisit/postfix.cc, src/ltlvisit/postfix.hh,
src/ltlvisit/relabel.cc, src/ltlvisit/simplify.cc, src/ltlvisit/snf.cc,
src/ltlvisit/tostring.cc, src/tgba/formula2bdd.cc,
src/tgbaalgos/ltl2taa.cc, src/tgbaalgos/ltl2tgba_fm.cc,
src/tgbaalgos/ltl2tgba_lacim.cc, src/tgbatest/ltl2tgba.cc,
iface/dve2/dve2check.cc: Remove all references to automatop.

* src/eltlparse/.gitignore, src/eltlparse/Makefile.am,
src/eltlparse/eltlparse.yy, src/eltlparse/eltlscan.ll,
src/eltlparse/fmterror.cc, src/eltlparse/parsedecl.hh,
src/eltlparse/public.hh, src/eltltest/.gitignore,
src/eltltest/Makefile.am, src/eltltest/acc.cc, src/eltltest/acc.test,
src/eltltest/defs.in, src/eltltest/nfa.cc, src/eltltest/nfa.test,
src/tgbaalgos/eltl2tgba_lacim.cc, src/tgbaalgos/eltl2tgba_lacim.hh,
src/tgbatest/eltl2tgba.test: Delete these files.
* src/Makefile.am, src/tgbaalgos/Makefile.am, src/tgbatest/Makefile.am,
src/tgbatest/ltl2tgba.cc, src/tgbatest/ltlcross.test,
src/tgbatest/spotlbtt.test, README, configure.ac: Adjust.