Make initial sanctuary be circular in shape rather than square.

Remove non-harmless clouds when laying down sanctuary, and don't allow non-harmless clouds to speard into sanctuary or be placed on it.

Don't let explosions spread into sanctuary (probably needs a flavour message).

If a giant spore or ball lightning somehow explodes while in sanctuary then give a message about Zin containing it's explosion, and skip the call to explosion().

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6284 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on July 1, 2008
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