Fixing a tiles issue where unseen tiles appeared to have nets. This was due to foreground tiles inadvertantly using the flags for background ones.

Fixing a tiles issue where the cursor would not be red/invalid on magic mapped, out of sight cells.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3496 c06c8d41-db1a-0410-9941-cceddc491573

Created by  ennewalker  on March 1, 2008
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