Add ircu-like /who format options.

Use  /quote help who  for details.
The format code "o" (oplevel) is not documented,
but implemented showing dummy information (999 for
chanop, n/a otherwise).

include/numeric.h

@@ -175,6 +175,7 @@ extern const char *form_str(int);
 #define RPL_VERSION          351
 
 #define RPL_WHOREPLY         352
+#define RPL_WHOSPCRPL        354 /* from ircu -- jilles */
 #define RPL_ENDOFWHO         315
 #define RPL_NAMREPLY         353
 #define RPL_WHOWASREAL       360