(tgba_explicit::create_transition(state*, const state*)): New function.
* src/tgbaalgos/randomgraph.cc, src/tgbaalgos/randomgraph.hh:
(random_graph): Revamp the algorithm to call rand() less often.
* src/tgbatest/randtgba.cc: Add option -0 to easy profiling.
* src/tgbaalgos/Makefile.am (tgbaalgos_HEADERS)
(libtgbaalgos_la_SOURCES): Add them.
* src/tgba/tgbaexplicit.hh (tgba_explicit::add_state): Make it public.
* src/tgbatest/randtgba.cc: New file.
* src/tgbatest/Makefile.am (noinst_PROGRAMS, readsave_SOURCES): Add it.
* src/tgbatest/readsave.test: Check a random graph.