Expand equip_undead() to handle smart undead as well as stupid undead,

and use it to equip Yred's enslaved intact souls. Also, allow undead capable of using items and drinking potions to drink potions of healing and heal wounds, since undead players can.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8310 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on January 7, 2009
2RJUPYKEDZZCW4GDG6WLEDVYF32ADC4W5I42KSKHN3MWEBCWSAHQC
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