Ghost time tweaks, self-harm bug fix

Players can now purge themselves (and any other self-harm spell) without
the guildmate protection code interfering.

Murderer ghost time defaults have been upped to 3 minutes, from 1 minute. One minute was far too short for everyone involved. Notably, the ghost penalty time resets if you're on for 1/5th of a penalty time, so murderers only had to remain online for 12 seconds to reset their ghost timer. It was all rather odd.

Innocent ghost time defaults have been lowered to 8 minutes, from 10 minutes. Ten minutes is definitely too long, but we don't want innocents to have too short of a ghost time.