[mr2598] fix visual problem with grid activating after teleport/login.
[mr2599] very detailed definition of the methods in WorldLocation classes chain (currently no real problems found). may solve problems or give point for corrects.
[12323] Remove creature from creature_linking table when deleting it.

Thank to alexluana and vovk for pointing.

Close https://github.com/cmangos/mangos-wotlk/issues/50
SD2 update
Merge branch 'master' into testing
some corrects in MMAP locking, related to #1297, testing.
more correct iterating in Player::SendAurasForTarget, related to #1298