Add a new type of automata: State-labeled Alternating Büchi

Automata (SABA).

* src/saba/saba.hh, src/saba/saba.cc, src/saba/sabastate.hh,
src/saba/sabasucciter.hh: New.  Interface for
SABA (State-labeled Alternating Büchi Automata).
* src/saba/explicitstateconjunction.cc,
src/saba/explicitstateconjunction.hh: New.  Default
implementation for a conjunction of states.
* src/saba/Makefile.am: New.
* src/Makefile.am, configure.ac: Adjust.
* src/sabaalgos/sabareachiter.cc,
src/sabaalgos/sabareachiter.hh: New.  Iterate over all reachable
states of a spot::saba.
* src/sabaalgos/sabadotty.cc, src/sabaalgos/sabadotty.hh: New.
Print reachable states in dot format.
* src/sabaalgos/Makefile.am: New.

src/Makefile.am

@@ -23,11 +23,10 @@ AUTOMAKE_OPTIONS = subdir-objects
 
 # List directories in the order they must be built.
 # Keep tests at the end.
-SUBDIRS = misc ltlenv ltlast ltlvisit ltlparse eltlparse \
-          tgba tgbaalgos tgbaparse \
-	  evtgba evtgbaalgos evtgbaparse \
-          kripke . \
-	  ltltest eltltest tgbatest evtgbatest sanity
+SUBDIRS = misc ltlenv ltlast ltlvisit ltlparse eltlparse tgba		\
+          tgbaalgos tgbaparse evtgba evtgbaalgos evtgbaparse kripke	\
+          saba sabaalgos ltltest eltltest tgbatest evtgbatest sabatest	\
+          sanity
 
 lib_LTLIBRARIES = libspot.la
 libspot_la_SOURCES =
@@ -45,6 +44,8 @@ libspot_la_LIBADD =  \
   evtgba/libevtgba.la \
   evtgbaalgos/libevtgbaalgos.la \
   evtgbaparse/libevtgbaparse.la \
+  saba/libsaba.la \
+  sabaalgos/libsabaalgos.la \
   kripke/libkripke.la
 
 # Dummy C++ source to cause C++ linking.