Horntail PQ & Exped + Equip levelup fix

Added Horntail PQ and boss fight. Fixed short integer overflow of
equipment stats on client messing up player stats.

scripts/reactor/2406000.js

@@ -0,0 +1,23 @@
+/*
+Dragon nest
+*/
+
+function sendToHeaven() {
+    rm.destroyNpc(2081008);
+    rm.mapMessage(6, "In a flicker of light, Nine Spirit's Little Dragon returns to the place it belongs, high above the skies.");
+    rm.getReactor().getMap().resetReactors();
+}
+
+function touch() {
+    if(rm.haveItem(4001094) && rm.getReactor().getState() == 0) {
+        rm.hitReactor();
+        rm.gainItem(4001094, -1);
+    }
+}
+
+function untouch() {}
+
+function act() {
+    rm.spawnNpc(2081008);
+    rm.schedule("sendToHeaven", 12 * 1000);
+}