Guild PQ + fixed negative EXP error

Implemented Guild PQ. Fixed a problem introduced earlier where negative
EXP would be deemed as "integer overflow", provoking many game breaking
issues as result.

scripts/portal/guild1F02.js

@@ -28,6 +28,7 @@ Save location to return.
 */
 
 function enter(pi) {
+        pi.getEventInstance().gridInsert(pi.getPlayer(), 1);
 	pi.warp(990000700, "st00");
 	return true;
 }