Preliminary support for Event-based GBA.

* src/evtgba/Makefile.am, src/evtgba/evtgba.cc,
src/evtgba/evtgba.hh, src/evtgba/evtgbaiter.hh,
src/evtgba/explicit.cc, src/evtgba/explicit.hh,
src/evtgba/product.cc, src/evtgba/product.hh,
src/evtgba/symbol.cc, src/evtgba/symbol.hh,
src/evtgbaalgos/Makefile.am, src/evtgbaalgos/dotty.cc,
src/evtgbaalgos/dotty.hh, src/evtgbaalgos/reachiter.cc,
src/evtgbaalgos/reachiter.hh, src/evtgbaalgos/save.cc,
src/evtgbaalgos/save.hh, src/evtgbaparse/Makefile.am,
src/evtgbaparse/evtgbaparse.yy, src/evtgbaparse/evtgbascan.ll,
src/evtgbaparse/fmterror.cc, src/evtgbaparse/parsedecl.hh,
src/evtgbaparse/public.hh, src/evtgbatest/Makefile.am,
src/evtgbatest/defs.in, src/evtgbatest/explicit.cc,
src/evtgbatest/explicit.test, src/evtgbatest/product.cc,
src/evtgbatest/product.test, src/evtgbatest/readsave.cc,
src/evtgbatest/readsave.test: New files.
* configure.ac: Create the Makefiles in these new subdirectories.
* src/Makefile.am: Recurse them.

configure.ac

@@ -64,6 +64,11 @@ AC_CONFIG_FILES([
   iface/gspn/Makefile
   iface/gspn/defs
   src/Makefile
+  src/evtgba/Makefile
+  src/evtgbaalgos/Makefile
+  src/evtgbaparse/Makefile
+  src/evtgbatest/Makefile
+  src/evtgbatest/defs
   src/ltlast/Makefile
   src/ltlenv/Makefile
   src/ltlparse/Makefile