In labyrinths, forget all grids outside a radius of 25*25 (non-Minotaur)

or 40*40 (Minotaur). This significantly increases difficulty again. The numbers are completely arbitrary but they appeared to work fine in testing.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7390 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on November 5, 2008
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