Remove old descriptor files from out/ after archiving
Unless I'm mistaken (or misconfigured) -- which is entirely possible -- collector will accumulate uncompressed data in out/ indefinitely, long after it's been archived in archive/ and will no longer be modified.
This takes up a lot of disk space and it'd be nice to
a) get confirmation I can remove data from out/ than is older than N months (2? 3?) b) have it deleted automagically (or at least with a config setting)