Each new type of portal vault should get its own des file.

Renamed portal.des to sewer.des. Added description.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7483 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dploog  on November 18, 2008
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