* src/tgba/tgbagraph.cc: New file.
* src/tgba/Makefile.am: Adjust.
* src/tgba/tgbagraph.hh (set_single_acceptance_set,
new_acc_transition): New methods.
(set_acceptance_conditions, merge_transitions): Move body
to tgbagraph.cc.
* src/tgbaalgos/complete.cc, src/tgbaalgos/degen.cc,
src/tgbaalgos/dtbasat.cc, src/tgbaalgos/dtgbacomp.cc,
src/neverparse/neverclaimparse.yy, src/dstarparse/dra2ba.cc,
src/dstarparse/nra2nba.cc: Simplify using these new methods.

* src/tgbaalgos/complete.cc, src/tgbaalgos/complete.hh
(tgba_complete_here): New method for tgba_digraph.
(tgba_complete): Rewrite using dupexp and the above.

* src/tgbaalgos/bfssteps.cc, src/tgbaalgos/complete.cc,
src/tgbaalgos/cycles.cc, src/tgbaalgos/dtgbacomp.cc,
src/tgbaalgos/gtec/gtec.cc, src/tgbaalgos/gv04.cc,
src/tgbaalgos/isweakscc.cc, src/tgbaalgos/lbtt.cc,
src/tgbaalgos/neverclaim.cc, src/tgbaalgos/reachiter.cc,
src/tgbaalgos/replayrun.cc, src/tgbaalgos/safety.cc,
src/tgbaalgos/save.cc: Avoid calls to done().

* src/tgbaalgos/postproc.cc, src/tgbaalgos/postproc.hh: Tweak set_pref()
to also accept Any|Complete, Small|Complete, or Deterministic|Complete.
* src/bin/common_post.hh, src/bin/common_post.cc: Add option --complete
and set comp.
* src/bin/dstar2tgba.cc, src/bin/ltl2tgba.cc, src/bin/ltl2tgta.cc: Pass
comp to set_pref().
* src/tgbaalgos/complete.cc: Preserve state-based acceptance.
* src/tgbatest/dstar.test, src/tgbatest/ltlcross2.test,
src/tgbatest/nondet.test: Augment tests.
* doc/org/dstar2tgba.org, doc/org/ltl2tgba.org, NEWS: Document.

* src/tgbaalgos/complete.cc, src/tgbaalgos/complete.hh: New files.
* src/tgbaalgos/Makefile.am: Add them.