(NS_UNDEF, NS_LIST, NS_DIST, NS_AREA, NS_ALL, NS_XY, NS_GROUP): Turn

macros into enumeration constants.
(ns_seltype): New.  Use where appropriate.

src/lib/subs/sarg.c

@@ -53,7 +53,7 @@
  *
  * or 0 for none of the above.
  */
-int
+ns_seltype
 sarg_type(s_char *ptr)
 {
     int c;