Change: added mana regeneration

Mana regeneration is now 10% of max mana per hour.
Merge branch 'master' of https://github.com/anylonen/omega

Merging two previous commits into one.
Refactor: typo in the function name
Removed random events from aux3.c
Refactored player regeneration
Change: tuned mana regen

Player power is now coefficient in the regen formula.
Minor refactoring in code
Refactored priest.[hc]

Mostly extracted methods from the increase_priest_rank method.
Merge branch 'refactoring' into LuaJIT