* src/tgbaalgos/stutter.cc: Add a new variant of Etessami's check, closer to his original paper in IPL. * src/ltltest/stutter.test: Add more tests. * bench/stutter/user.sh: Include this new variant in the benchmark.
* bench/stutter/user.sh: New bench. * bench/stutter/Makefile.am: Add it. * bench/stutter/README: Mention it. * bench/stutter/stutter_bench.sh: Run it.