Throwaway PK damage cut

Murderers damaging innocents will have their damage cut if there has
been no investment in the character. 50 hp reds will do 1/3rd damage, 75
hp will do half, 100 hp will do 2/3rds, reaching full damage at 150 hp.

Always been kind of silly that someone can roll up a toon, get just past
angeled, and then blow away noobs. It's not good practice to let players
with no investment in a server or a character attack those that *are* invested.

Included here is a removal of the Jewel of Froz HP dependency. If 
throwaway murderer damage is cut with this method, Jewels of Froz
no longer need inherent damage cuts for low health players.