v2.0.0 put every atlas under /data/<atlas>/, which broke the original
/<atlas>/static/ download links and kept the data out of the modules/
layout the other sites use.
- read tree.json and items.json from /<atlas>/modules/xoonips/ and
link the files under /<atlas>/modules/xoonips/file/
- redirect download.php, the v2.0.0 /data/ paths and the older
/<atlas>/file/ paths with a 301
- send directories without an index.html to the SPA as well: the
atlas directories now exist on disk, and the old rule served them
as a 404
orrisroot
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