* src/bin/common_setup.cc (display_version): New function.
(setup): Hook the display_version function.
(argp_program_bug_address): Define this common variable here.
* src/bin/genltl.cc, src/bin/ltl2tgba.cc, src/bin/ltl2tgta.cc,
src/bin/ltlfilt.cc, src/bin/randltl.cc (argp_program_bug_address,
argp_program_version): Remove these definitions.