Changes to InterruptSpell to correct some messages.

Decreased failure chance for FD.
Removed the message when your hate list is cleared due to FD.
FD will now be broken when a detrimental spell is cast on you.

Added see invis to #showstats

InvisVs Undead and Animal will no longer set an invisible flag.

You can now lifetap Eye of Zomm.

Defense skillups should now be more in line with the other defensive skills.

Removed unused code.