the regeneration mutation.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9381 c06c8d41-db1a-0410-9941-cceddc491573
WT6AO2URVL7VQ4ZLAGEXL7CMJ7QPS4UZWTNX4AAMSDQDGASF6K3QC
62DV3QQRD57QGSWULAN2FNJ2AJA5NHHSURPIZJ5RJXU3QX2B76TQC
K2CS6TCX2NDVL2ASEHGP4J4K4IJ6FP3ANNKTSIWVG43HPYSBX6ZQC
KFULGQQOHWUTXOM3BXCCYPGGVGGY4Z6265XUFRCBPNLTZAEHJZSQC
case MUT_REGENERATION:
case MUT_SLOW_HEALING: