If create_spec_object() is given the name of a spellbook which doesn't

exist, treat the name as a spell name and try to find a spellbook containing that spell.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5425 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on June 1, 2008
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