Changes to possess, hold person, favor loss in arenas

The possess spell has been reworked. The mana cost and casting time have been
reduced, and some various display-related improvements have been made for when
a target is being possessed.

The hold person spell has been reworked. The spell is now more likely to be
successfully cast, but the duration has been reduced to two rounds, and the
mana cost and casting time have been significantly increased.

The recent fight timer (adrenaline timer), previously available to deadly
characters only, is now displayable to peacefuls as well using %e, and is also
now available in MSDP data.

You will no longer lose favor when fleeing from combat within a pkill arena.