Tweak command can now accept hexadecimal values.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2274 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on October 1, 2007
3N2AI5NJNEL4RURNNI5CWIVD5NOE2J5GMDTPW7XYKPGV2BSLRDRQC
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