Port the `coin' plugin from VitaminA

plugins/eval

@@ -65,11 +65,11 @@ msg_command == "PRIVMSG" \
 	ctx = substr(msg_prefix, RSTART, RLENGTH)
 	if (msg_param[0] ~ /^[#&!+]/)
 	{
-		ctxquote = ctx ": "
+		ctx_quote = ctx ": "
 		ctx = msg_param[0]
 	}
 	else
-		ctxquote = ""
+		ctx_quote = ""
 
 
 	if (substr(msg_param[1], 1, length(prefix)) == prefix)
@@ -87,7 +87,7 @@ msg_command == "PRIVMSG" \
 
 function pmrespond (text)
 {
-	print "PRIVMSG " ctx " :" ctxquote text
+	print "PRIVMSG " ctx " :" ctx_quote text
 }
 
 function process_request (input,    res, x)