[12623] Simplify and add comments to new stats system code.
[12624] Correctly use custom value for specified creature rank in config file. Also add check to ensure final health is at least 1.
[12625] Hotfix broken ACE configure script of [12619]

Note: This will reintroduce problems for MacOS. So a proper patch is still pending.

Reopen cmangos/issues#85
[12626] Improve "NPCs gets stuck in melee animation while casting".

Fix cmangos/issues#379