complete Alexandre's patch

* bench/dtgbasat/formulas: Typo.
* NEWS: Mention the fix.
* AUTHORS: Add Alexandre.

AUTHORS

 The following people have contributed code to Spot:
 
 Ala-Eddine Ben-Salem
+Alexandre Gbaguidi Aïsse
 Alexandre Duret-Lutz
 Alexandre Lewkowicz
 Amaury Fauchille

NEWS

@@ -40,6 +40,9 @@ New in spot 2.1.1.dev (not yet released)
 
   * Fix ltlcross crash when combining --no-check with --verbose.
 
+  * Adjust paths and options used in bench/dtgbasat/ to match the
+    changes introduced in Spot 2.0.
+
 New in spot 2.1.1 (2016-09-20)
 
   Command-line tools:

bench/dtgbasat/formulas

@@ -92,8 +92,7 @@ G(G!a | F!c | G!b)
 # Generated with
 # randltl -n -1 a b c |
 # ltlfilt --remove-wm -r -u --size-min=3 --size-max=15 --syntactic-recurrence |
-# ltlfilt -v --obligation |
- ../../bin/ltl2tgba -F - -x tba-det -D --stats='%d,%f' |
+# ltlfilt -v --obligation | ltl2tgba -F - -x tba-det -D --stats='%d,%f' |
 # grep 0, | head -n 30
 
 X(Fc W b) R Fa