Cleaned up some of the randart code.

Fixed a free-without-malloc security issue (of art_n.)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1291 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on April 13, 2007
H7BW6SEIQ57X6V4BM2RX54W42W6BH5XJBAS6FYCYKLQQG43ZMU4QC
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