Merge branch '1.6b6-predator' into 'master'

1.6b6 predator

predator: kill limit is constant and increased to 50.  
predator: atk and apr bonuses scaling modified to reflect constant kill limit.  
predator: hate on hit removed.  
predator: atk and apr bonuses shown on actor tooltip, instead of killcount.  
savage hunter: rng to apply effect.  
shrouded hunter: Crit shrug replaced with physpower for a less rng bonus and to provide a more offensive feel.

See merge request !561