Fix SMALLINT only allowing 65535 players to log

We just ran into the problem where new users didn't make any edits and after some digging I just found out why:
The playerid in the kb-players table was a SMALLINT. Changing that to an INT should work for some more years now ;-)
Merge pull request #378 from DerFlash/fixPlayerMax

Fix SMALLINT only allowing 65535 players to log