Changing expModifier and hpModifier algo to be less influenced by level. For high lvls (~50), you actually get HP instead of losing them with the current formula. This now doesn't happen anymore (at least for levels up to 100, which is the current max).
Merge pull request #627 from toebu/high-level-algo-fix

Changing expModifier and hpModifier algo to be less influenced by level....