many changes and improvements

lang/cem/libcc.ansi/headers/LIST

@@ -0,0 +1,23 @@
+assert.h
+ctype.h
+dirent.h
+errno.h
+float.h
+grp.h
+limits.h
+locale.h
+math.h
+mathconst.h
+setjmp.h
+sgtty.h
+signal.h
+stdarg.h
+stddef.h
+stdio.h
+stdlib.h
+string.h
+time.h
+sys/dirent.h
+sys/errno.h
+sys/stat.h
+sys/types.h