Make Zin's Revitalisation easier to adjust in terms of power by making

the MP increase relative to the HP increase. As a side effect, the MP increase is a bit more powerful; at maximum power, it's now 7 instead of 5.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4422 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on April 20, 2008
IDVXDTVLNXRKZ32SEMIDKW5OM2C2SI2XNQWHLRZN33GOOSGYQ5WQC
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