Fix [2004924], using sorear's suggested method: Avoid doing fractional

arithmetic in _exercise2() by pre-multiplying the factors by 10, which allows crosstraining to work properly when the experience pool isn't full.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6322 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on July 1, 2008
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