Bug 2800889: beams that can pass through a monster and run into a wall behind

it would warn that there was a wall blocking the line of fire.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9898 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on June 5, 2009
T4T7OQCYZ3O5YWJIUZANEGBG3BXWRBM74U52WF62QTSC42ZYGWEAC
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