Skillbook announcer + isInJobTree fix

Abdula is now the Skillbook announcer NPC. Fixed some inconguencies with
the isInJobTree function, now properly returning if a skill id does make
presence on a player's current job path or not.

scripts/npc/9010002.js

@@ -0,0 +1,9 @@
+function start() {
+    status = -1;
+    action(1, 0, 0);
+}
+
+function action(mode, type, selection) {
+	cm.sendNext("Hi, I'm #p9010002#.");
+	cm.dispose();
+}