twa_run: swallow reduce_run, replay_twa_run, twa_run_to_tgba

These now become twa_run::reduce, twa_run::replay, and
twa_run::as_twa.

* src/twaalgos/reducerun.cc, src/twaalgos/reducerun.hh,
src/twaalgos/replayrun.cc, src/twaalgos/replayrun.hh: Delete.
* src/twaalgos/Makefile.am: Adjust.
* src/twaalgos/emptiness.cc, src/twaalgos/emptiness.hh: Move
the above functions here, as method of twa_run.
* src/bin/common_aoutput.hh, src/bin/ltlcross.cc,
src/tests/emptchk.cc, src/tests/ikwiad.cc, src/tests/randtgba.cc,
wrap/python/ajax/spotcgi.in, iface/ltsmin/modelcheck.cc: Adjust.
* NEWS: List the renamings.

src/twaalgos/Makefile.am

@@ -62,11 +62,9 @@ twaalgos_HEADERS = \
   randomgraph.hh \
   randomize.hh \
   reachiter.hh \
-  reducerun.hh \
   relabel.hh \
   remfin.hh \
   remprop.hh \
-  replayrun.hh \
   safety.hh \
   sbacc.hh \
   sccfilter.hh \
@@ -119,10 +117,8 @@ libtwaalgos_la_SOURCES = \
   randomgraph.cc \
   randomize.cc \
   reachiter.cc \
-  reducerun.cc \
   remfin.cc \
   remprop.cc \
-  replayrun.cc \
   relabel.cc \
   safety.cc \
   sbacc.cc \