Add blood and glass to labyrinths.

In ASCII wizard mode these features are highlighted in the level map (&{) and can then easily be reached via xm (normal map), but only until the first shift takes place. Feedback welcome!

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7637 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on November 26, 2008
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