Add a blessing to remove harmful ailments (poisoning, sickness,

confusion, and rotting), and use it in bless_follower() instead of healing when it's needed.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3815 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on March 22, 2008
LDUASYI655NEH3OVWWYYQ2UV4KVC5FAJOX4IIVJEKZ43S2KKMAGQC
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