Renaming Cba into Bac.

Makefile

@@ -14,7 +14,7 @@ PROG := abc
 MODULES := \
 	$(wildcard src/ext*) \
 	src/base/abc src/base/abci src/base/cmd src/base/io src/base/main \
-	src/base/ver src/base/wlc src/base/cba src/base/pla src/base/test \
+	src/base/ver src/base/wlc src/base/bac src/base/cba src/base/pla src/base/test \
 	src/bdd/cudd src/bdd/dsd src/bdd/epd src/bdd/mtr src/bdd/parse \
 	src/bdd/reo src/bdd/cas \
 	src/map/mapper src/map/mio src/map/super src/map/if \