Partial implementation of FR #2011386: Xom shouldn't directly kill the player

unless he's being nasty (the player is under penance from Xom or Xom is bored). I've put checks into _xom_is_good() and _xom_is_bad() to avoid this as much as possible, and as a safety-net changed ouch() to return early if the player dies from a Xom effect when Xom wasn't being nasty so that xom_acts() can then fix things up (this causes Xom to give a message from "Xom accidental homicide" in dat/database/godspeak.txt)

Next up will be an addition to mutate() so you can request random mutations be non-lethal, which should take care of all known situations where ouch() returns early due to Xom making a mistake.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7833 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on December 14, 2008
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