Revert r8981, specifically the part which changed how max MP depends

on class and spellcasting (the !oMagic change is still in.)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9001 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on February 8, 2009
I3GNXBIGS7FK6WL3ZSVPRM6FRICFU4FCIJQFK6VB4YLF2SBLGIXAC
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