Fix 1858979: Monsters being capable to reach through wallsl.

(And some cleanup.)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5136 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on May 19, 2008
627CM2ZOKVBMPVPBYGWBWWPT2FBMVRRH2VDGPT6Z5XCVJ5R4YQWQC
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