Add immunity checks for prompts about beams potentially hitting yourself

(not counting self-targetting since what we're trying to avoid in that case is loss of magic as well as self-damage) and add some special cases for Evaporate, so the potions use appropriate resistances without leaking information on the random choices.

Let Enhancers start with Short Blades skill 1.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6627 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on July 21, 2008
K33CV7EYR37TTSEXQWQ6QPHSEUFO545AIPUZOA2C47QTUCUWFPAAC
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