Redo potions of magic again. They are now effectively potions of heal wounds

for MP; there is never any max-MP gain. Classes no longer influence max MP. Instead, you get an extra MP point for each level of Spellcasting between 1 and 5. (This might be too good.) Invocations does not get this boost.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8981 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on February 8, 2009
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