-Fix bugreport:9084 getitemX unable to found item by id
-Upd itemdb, itemdb_combo, itemdb_group change key for unsigned int, since they no longer signed
Bugfixed, bugreport:9085. Wrong var in SP_ADD_ITEMGROUP_HEAL_RATE statement.

Signed-off-by: Cydh Ramdh <house.bad@gmail.com>
Merge pull request #3 from rathena/master

merging..