Make draining beams use actor::drain_exp() too, and make the necromancy

conduct for draining consistent between beams and melee attacks.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8510 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on January 17, 2009
7Z4ZIXRD3RNS3GXJAKWTMG5PRKYMK3GLP6S7GA32ENYH6DWTGF3AC
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