Adding SVN revision number (and build date) into .sav files.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8220 c06c8d41-db1a-0410-9941-cceddc491573

Created by  ennewalker  on January 4, 2009
KSFNXBKBU4XJLJMHLVG73ZFW5CGN2D7UN32OUFHCXMHFOWF7C6TAC
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