Add more blessing adjustments.

For Beogh, have a random chance of doing them directly upon living kills, instead of on piety gain. First, TSO should be doing this eventually too, so the framework should be in place. Second, piety gain is slower at high piety levels, which makes blessings granted in do_god_gift() occur less often as you become more messianic, which seems wrong.

Make random blessings also occur a bit less often, so you don't get a long string of them, and make them occur randomly on experience level gain again; if you're pious enough, the latter should still occur often.

A random follower can be blessed when you kill, but when a follower kills, it can be specifically blessed. Also, messages for blessings of out-of-view followers now just refer to "your follower."

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3831 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on March 23, 2008
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