* src/misc/Makefile.am: Add it.
* src/tgbaalgos/emptiness.cc, src/tgbaalgos/emptiness.hh: Add option
facilities to the classes emptiness_check and emptiness_result
* src/tgbaalgos/magic.cc, src/tgbaalgos/magic.hh,
src/tgbaalgos/se05.cc, src/tgbaalgos/se05.hh: Compute optionnaly
accepting runs from stack.
* src/tgbatest/randtgba.cc: Make this option public.