Fixed tile compile. (I was being a bit overzealous in my cleanup.)

Fix 1922815: blood potion assert. Implement 1828037: prompt before entering harmful clouds

And tidy up fountain handling, dried non-magic fountains may now also start flowing again.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3878 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on March 25, 2008
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