Gave Mob Families HP Stat + Mob HP Fix

[lautan]

This is a pretty big change and I put a lot of research into it. You can check my calculations here: https://docs.google.com/spreadsheet/ccc ... wUVE#gid=0

There are two changes:

Mob families now have a HP / MP stat. This will either give them a increase or decrease in HP. For example worms have less HP, sheep have more HP.
I fixed the HP level growth. I found the current formula inaccurate and gave low level mobs too much HP. I based calculations off lots of research posted above.
NMs only get double HP, I found 2.5 was too much.

I found that mobs get a hp boost at 25 and 50. There are also incremental boosts every 10 levels at 35, 45, 55 etc.

[whasf]

committed r2233