rename Doxygen groups

Automatic mass renaming.

* src/dstarparse/public.hh, src/hoaparse/public.hh,
src/kripke/fairkripke.hh, src/kripke/kripkeprint.hh,
src/tgba/bdddict.hh, src/tgba/tgba.hh, src/tgba/tgbamask.cc,
src/tgba/tgbamask.hh, src/tgba/tgbaproduct.hh, src/tgba/tgbaproxy.hh,
src/tgba/tgbasafracomplement.cc, src/tgba/tgbasafracomplement.hh,
src/tgbaalgos/are_isomorphic.hh, src/tgbaalgos/bfssteps.hh,
src/tgbaalgos/canonicalize.hh, src/tgbaalgos/degen.hh,
src/tgbaalgos/dotty.hh, src/tgbaalgos/dupexp.hh,
src/tgbaalgos/emptiness.hh, src/tgbaalgos/hoa.hh,
src/tgbaalgos/isdet.hh, src/tgbaalgos/isweakscc.hh,
src/tgbaalgos/lbtt.hh, src/tgbaalgos/ltl2taa.hh,
src/tgbaalgos/ltl2tgba_fm.hh, src/tgbaalgos/minimize.hh,
src/tgbaalgos/neverclaim.hh, src/tgbaalgos/postproc.hh,
src/tgbaalgos/powerset.hh, src/tgbaalgos/projrun.hh,
src/tgbaalgos/randomgraph.hh, src/tgbaalgos/reachiter.hh,
src/tgbaalgos/reducerun.hh, src/tgbaalgos/replayrun.hh,
src/tgbaalgos/simulation.hh, src/tgbaalgos/stats.hh,
src/tgbaalgos/stripacc.hh, src/tgbaalgos/translate.hh:
Rename all documention group starting with tgba_ as
group starting with twa_.

src/tgba/bdddict.hh

@@ -36,7 +36,7 @@ namespace spot
   /// \brief Private data for bdd_dict.
   class bdd_dict_priv;
 
-  /// \ingroup tgba_essentials
+  /// \ingroup twa_essentials
   /// \brief Map BDD variables to formulae.
   ///
   /// The BDD library uses integers to designate Boolean variables in