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/speargate_open.js

@@ -26,7 +26,7 @@
 
 function enter(pi) {
     if (pi.getPlayer().getMap().getReactorByName("speargate").getState() == 4) {
-        pi.warp(990000401);
+        pi.warp(990000401, 0);
         return true;
     } else {
         pi.getPlayer().dropMessage(5, "This way forward is not open yet.");