Actually replace sold out shops with the new feature DNGN_ABANDONED_SHOP.

This makes comparisons much easier and also avoids giving away information about far away shops being opened/closed. (This was only an issue if a shop only held blood potions that rotted away, but still.)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7775 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on December 7, 2008
J7VTRSN2BLWL7QJMHG73LBUOUL6WNNT2ZAVEDMGYB6SDX3L5GGYQC
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