Replace "is_random_artefact()" with "is_artefact()" in a few places where

this was missed, and add checks for unrandart and special unrandarts where applicable.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10044 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on June 25, 2009
B7RFPXVV7Y7EXQZ5XUPB2WQYHGNZB6ERYKBTRCXENTHKW4D3FIMAC
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