Slightly improved handling of ties and suicidal giant spores, plus more sanity

checking.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8267 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on January 6, 2009
3EREXXQMWTOWPI5ZV4UABEIR4RTGPNM7V2O6CG2EOFPHA5GEB2WAC
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