Expand bless_follower() to allow explicitly picking the follower as well

as picking one randomly, fix a potential problem with the display of the blessing message, and add a piety-dependent chance that followers will be specifically blessed when gaining levels.

Hook the last of these up to Beogh for now (since the random chance on piety gain occurs less and less often as piety goes up). TSO should also get this eventually.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3821 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on March 22, 2008
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