Additional listing options, improve help output, fix macro limits

Additional listing options:

   -Ld to display counts in decimal
   -Lp to output a list file in every pass (to make sure one exists)

Clean up the help output and make it comprehensive. The -hf and -y
options are no longer necessary, although they are supported for
backwards compatiblity.

Fix macro-levels so it actually count descent levels; a new
macro-tokens limit introduced for the actual token limit.

Slightly simplify the limits code.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

output/codeview.c

@@ -59,7 +59,7 @@ static void cv8_output(int type, void *param);
 static void cv8_cleanup(void);
 
 const struct dfmt df_cv8 = {
-    "Codeview 8",               /* .fullname */
+    "Codeview 8+",              /* .fullname */
     "cv8",                      /* .shortname */
     cv8_init,                   /* .init */
     cv8_linenum,                /* .linenum */