remove tgba_explicit variants and the old scc_filter

* src/tgba/tgbaexplicit.cc, src/tgba/tgbaexplicit.hh: Delete.
* src/tgba/Makefile.am: Adjust.
* src/tgbaalgos/reductgba_sim.cc, src/tgbaalgos/reductgba_sim.hh:
Delete these obsoleted algorithms.
* src/tgbaalgos/Makefile.am: Adjust.
* src/tgbatest/explicit.cc, src/tgbatest/explicit.test,
src/tgbatest/explicit2.cc, src/tgbatest/explicit2.test,
src/tgbatest/explicit3.cc, src/tgbatest/explicit3.test:
Delete.
* src/tgbatest/Makefile.am: Adjust.
* src/bin/ltl2tgba.cc, src/priv/countstates.cc,
src/tgbaalgos/isweakscc.cc, src/tgbaalgos/lbtt.cc,
src/tgbaalgos/ltl2tgba_fm.cc, src/tgbaalgos/minimize.cc,
src/tgbaalgos/minimize.hh, src/tgbaalgos/powerset.cc,
src/tgbaalgos/powerset.hh, src/tgbaalgos/sccfilter.cc,
src/tgbaalgos/sccfilter.hh, src/tgbaalgos/simulation.cc,
src/tgbatest/explprod.cc, src/tgbatest/ltl2tgba.cc,
src/tgbatest/powerset.cc, src/tgbatest/tgbaread.cc,
src/tgbatest/tripprod.cc, wrap/python/ajax/spot.in,
wrap/python/spot.i: Remove all remaining references to
tgba_explicit.

src/tgbatest/Makefile.am

@@ -33,9 +33,6 @@ check_SCRIPTS = defs
 check_PROGRAMS = \
   bitvect \
   complement \
-  explicit \
-  explicit2 \
-  explicit3 \
   expldot \
   explprod \
   intvcomp \
@@ -51,9 +48,6 @@ check_PROGRAMS = \
 # Keep this sorted alphabetically.
 bitvect_SOURCES  = bitvect.cc
 complement_SOURCES = complementation.cc
-explicit_SOURCES = explicit.cc
-explicit2_SOURCES = explicit2.cc
-explicit3_SOURCES = explicit3.cc
 expldot_SOURCES  = powerset.cc
 expldot_CXXFLAGS = -DDOTTY
 explprod_SOURCES = explprod.cc
@@ -74,8 +68,6 @@ tripprod_SOURCES = tripprod.cc
 TESTS = \
   intvcomp.test \
   bitvect.test \
-  explicit.test \
-  explicit2.test \
   ltlcross3.test \
   taatgba.test \
   tgbaread.test \