Add reset() method to radius_iterator so that a single iterator

instance can be re-used.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5619 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on June 8, 2008
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