As per FR 2539914, round all aptitudes to the nearest multiple of 10.

This includes Spellcasting and Evo-/Invocations.

Actual gameplay effects of losing 5 points somewhere should be small.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10528 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on August 12, 2009
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