Back out all Thomas's changes on emptiness checks since

2004-08-23.  Some of these will need to be reintegrated more
slowly and cleanly.

* src/tgbaalgos/Makefile.am, src/tgbaalgos/gtec/ce.cc,
src/tgbaalgos/gtec/ce.hh, src/tgbatest/Makefile.am,
src/tgbatest/emptchk.test, src/tgbatest/ltl2tgba.cc: Revert.
* src/tgbaalgos/colordfs.cc, src/tgbaalgos/colordfs.hh,
src/tgbaalgos/minimalce.cc, src/tgbaalgos/minimalce.hh,
src/tgbaalgos/nesteddfs.cc, src/tgbaalgos/nesteddfs.hh,
src/tgbaalgos/nesteddfsgen.cc, src/tgbaalgos/nesteddfsgen.hh,
src/tgbaalgos/tarjan_on_fly.cc, src/tgbaalgos/tarjan_on_fly.hh:
Delete.

src/tgbatest/Makefile.am

@@ -64,8 +64,6 @@ tripprod_SOURCES = tripprod.cc
 # Keep this sorted by STRENGTH.  Test basic things first,
 # because such failures will be easier to diagnose and fix.
 TESTS = \
-  reduccmp.test \
-  reductgba.test \
   explicit.test \
   tgbaread.test \
   readsave.test \
@@ -79,6 +77,8 @@ TESTS = \
   tripprod.test \
   mixprod.test \
   dupexp.test \
+  reduccmp.test \
+  reductgba.test \
   emptchk.test \
   emptchke.test \
   spotlbtt.test