Fixed reaching checking for 1 mp although it no longer uses mp. Made it easier to reach past monsters, and fixed failed attempts to reach past a monster attacking the monster (b0rsuk).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3142 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on December 29, 2007
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