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
NR7PW3FTNYTZEM7RSWVNMWB5NQHRDMMY3TB6L5II5VCW76OAMT6QC