Allow true randarts to occasionally recurse themselves.

If the curse property is chosen, there's a 33% chance of allowing recursing with equal chances for values = [1..5].

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4407 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on April 20, 2008
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