Add a check for whether a monster with water habitat can reach the

player and only consider such monster unsafe if there is a path. Replace the old runrest_ignore_monster checks for aquatic monsters with this one, which has the side effect of being nicer to Merfolk.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10701 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on September 17, 2009
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