Add Deep Dwarves patch, with some minor changes.

Add a new mutation, MUT_SLOW_HEALING, which at level 3 blocks all healing; it can't be acquired randomly, but deep dwarves start with it at level 3. This overrides regeneration, including the god-given kind (Trog's Hand.) Fix mutation listings (hopefully I got this right.) There are still some cases where DD HP shaving is not applied: ability HP costs, Staff of Dispater effect, vampiric draining backlash, Sublimation of Blood spell. Fix dancing weapons leaving mgrd incorrect if their weapon can't be generated. Breaks saves.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9173 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on February 23, 2009
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