Made Tome of Destruction more consistent for those with high Evoc.

Made manuals visibly different from spellbooks. Also, you can't cancel reading a manual; so you risk wasting it if you read all unIDed books.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2851 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on November 13, 2007
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