If an explosion has its center in Sanctuary then give a message about

Zin containing the explosion. Mainly for miscast effects which cause explosions, but also catches the player casting spells which cause explosions.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6323 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on July 1, 2008
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