Expand restore_stat() to allow for more fine-grained constrol of stat

restoration; the amount to be restored can now be specified. Use this where necessary.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4417 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on April 20, 2008
H6ZPCZ7HN5UZTOS6QFAE4WUJR6BCDU4OB7ONQ7ELXIK65ASPJOTAC
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