handle /nick <realnick>

CHANGESTODO

@@ -261,10 +261,6 @@ ________________________________________________________________________
 ________________________________________________________________________
 == MINOR DELEGATES =====================================================
 ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
-- xxx ist eigentlich xxx in Verkleidung.
-  /nick should silently ignore when a user tries to use its real nick
-  as its masquerade.
-
 - psyced generates tags for /enter operations. since these weren't generated
   by a client they may confuse a client. fippo thinks these _tag and _tag_reply
   should be removed from the messages before the get forwarded to clients.
@@ -3873,7 +3869,6 @@ net/library/legal
 	"/register /password whatever" - so: disabled ' ' in passwords now
 psycmuve.i renamed into master/accept
 +	added support for TLS autodetect
-== BETA ==
 archetype
 -	fixed "/topic x" with a single letter
 +	added timestamps to topic
@@ -3915,4 +3910,6 @@ irc.textdb
 install.sh
 -	many a million times people presumed they should edit local.h in
 	config/default. maybe it helps if it's called config/blueprint.
-
+=== 200902 ============================================================
+archetype
++	when joe says "/nick joe" it is understood as removing the /nick

world/net/place/archetype.gen

@@ -2483,6 +2483,7 @@ sMasquerade(a) {
 # ifdef SIGS
 _request_nick_local(source, mc, data, vars, b) {
 	string a;
+	string ni;
 
 # ifdef PLACE_MASQUERADE_COMMAND
 	unless (qMasquerade()) {
@@ -2490,10 +2491,12 @@ _request_nick_local(source, mc, data, vars, b) {
 		return 1;
 	}
 # endif
+       	ni = vars["_nick"];
+	ASSERT("_request_nick_local (source has nick)",
+	       stringp(ni) && strlen(ni), ni)
 	a = vars["_nick_local"] || vars["_value"];
-	unless (stringp(a) && strlen(a)) {
-		string ni = snames[source];
-
+	unless (stringp(a) && strlen(a) && stricmp(a, ni)) {
+		ni = snames[source];
 		if (ni) {
 			sendmsg(source, "_echo_place_nick_removed",
 			    0, ([ "_nick_local" : ni ]));
@@ -2510,7 +2513,7 @@ _request_nick_local(source, mc, data, vars, b) {
 # ifndef PLACE_MASQUERADE_SECRET
 	castmsg(source, "_notice_place_masquerade",
 	    "[_nick] now masquerades as [_nick_local].",
-	     ([ "_nick" : vars["_nick"], "_nick_local" : a ]));
+	     ([ "_nick" : ni, "_nick_local" : a ]));
 # else
 				// FIXME
 	previous_object()->w("_echo_place_nick",