Regenerate source GF parser from GF.cf. Now, when GF/Source/Makefile is used, no hand-hacking is needed.

src/GF/Source/Makefile

@@ -1,6 +1,7 @@
 all:
 	cd ../.. && bnfc -p GF.Source -bytestrings -sharestrings GF/Source/GF.cf
 	rm ErrM.hs
+	perl -i -pe 's/%name pModHeader ModHeader/%partial pModHeader ModHeader/' ParGF.y
 	perl -i -pe 's/GF.Source.ErrM/GF.Data.ErrM/' *.hs *.x *.y
 	happy -gca ParGF.y
 	alex -g LexGF.x