Fix giving an interruption message when a monster ignored with the

runrest_ignore_monster option gets too close. Also give a more informative interruption message when an air elemental quits being "submerged" in the air, and give a new message when it first "submerges" itself into the air.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2451 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on October 13, 2007
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