I'm guessing you could use something like:
http://code.xwiki.org/xwiki/bin/view/Snippets/DeleteSpaceSnippet
to build a listing of the files versions and then create links or checkboxes
or something like that to delete the ones you are interested in.
You can get the full list of versions using $doc.getRevisions() which
returns a org.suigeneris.jrcs.rcs.Version[]. You could then iterate through
that list and delete all versions but the last.
HTH,
.:. Kevin
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