Change recursing to work similarly as was suggested by {bdr} - Brent?

The curses property now may take any range of numbers, rather than plain 0 or 1. If its value is different from 0, the randart is created cursed. For positive values, it may additionally recurse itself with 1/value probability. In this case, add a description line ("It may recurse itself.") and an auto-inscription ("Curse", comes last).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4406 c06c8d41-db1a-0410-9941-cceddc491573

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