make tab completing filenames with ':' '=' '$' '`' work as well as

others (colon and equals sign need to be simply escaped, while dollar
sign and accent gravis need double escaping like opening square brak-
ket did back then); add = to C_QUOTE to simplify (doesn't break any-
thing) and sort these strings asciibetically while here

eval.c

@@ -22,7 +22,7 @@
 
 #include "sh.h"
 
-__RCSID("$MirOS: src/bin/mksh/eval.c,v 1.69 2009/09/06 17:42:12 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/eval.c,v 1.70 2009/10/30 00:57:37 tg Exp $");
 
 /*
  * string expansion
@@ -1179,7 +1179,7 @@ trimsub(char *str, char *pat, int how)
  * Name derived from V6's /etc/glob, the program that expanded filenames.
  */
 
-/* XXX cp not const 'cause slashes are temporarily replaced with nulls... */
+/* XXX cp not const 'cause slashes are temporarily replaced with NULs... */
 static void
 glob(char *cp, XPtrV *wp, int markdirs)
 {