* src/ta/taproduct.cc, src/ta/tgtaproduct.cc, src/ta/tgtaproduct.hh,
src/taalgos/emptinessta.cc, src/tgbatest/ltl2ta.test: 80 columns.
* src/ta/tgta.hh, src/ta/tgtaproduct.hh, src/taalgos/emptinessta.hh,
src/taalgos/tgba2ta.hh: Fix include gards.
* src/taalgos/tgba2ta.hh: Remove superfluous includes.
* src/taalgos/tgba2ta.cc: Add missing include.
* src/tgbatest/ltl2tgba.cc: Fix use of bdd_true().