Fix wording for translucent rock walls (1798932).

Change freshness calculation for chunk sorting: all chunks now sorted oldest to freshest, listing rotten last for non-Saprovores. Small comment fixes.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2221 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on September 26, 2007
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