Make being caught in a net interrupt the stair delay, and disallow beholding

attempts (mermaid) while the player is taking some stairs.

Also add a message for wielding a weapon of distortion. (I'm afraid there already used to be one that I've accidentally removed.)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3385 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on February 2, 2008
BBQWA33DPXWEDYOOPO45VAYD4JQDZQVMZSEJ4RUI5LLC733IMIIQC
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