Fixed stash-tracker seeing through walls (it was using stale LOS after blink/teleport), fixed shadow creatures crash in labyrinths, and fixed use of displayed stair glyph for handling selection of monsters placed on stairs (display glyphs can be changed by the user).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2855 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on November 15, 2007
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