Clean up the routine for Lee's Rapid Deconstruction a bit, and allow

not-fully-petrified monsters to be exploded as well (taking the same amount of damage as an ice statue, as opposed to that of a stone golem, which is taken by fully petrified monsters).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7113 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on October 3, 2008
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