* src/ltlenv/defaultenv.hh, src/ltlenv/defaultenv.cc (require): Return
an atomic_prop*, not a formula*.
* src/bin/randaut.cc, src/bin/randltl.cc, src/ltlvisit/apcollect.cc,
src/tgbatest/ltl2tgba.cc, src/tgbatest/randtgba.cc: Do not cast
the return of require().
* src/bin/randaut.cc, src/bin/man/randaut.x: New files.
* src/bin/Makefile.am, src/bin/man/Makefile.am: Adjust.
* src/tgbaalgos/randomgraph.hh, src/tgbaalgos/randomgraph.cc:
Add an option to output state-based acceptance, and update
the TGBA properties.
* src/tgbatest/randaut.test: New test.
* src/tgbatest/Makefile.am: Add it.
