One click to delete all errs

[sodabrew]

Implements #29

[sodabrew]

I wonder if it would be better to delete by date rather than all or nothing.

[bwitt]

Usually we're archiving them all (to /rq/tmp/queuename). Can we do that instead? Also if /rq/tmp/queuename is owned by root or otherwise unwriteable, we just put into /rq/tmp (this is what the clean_rq_errors.sh script does)

[sodabrew]

At what point do the errors actually get deleted? This seems like sweeping under the rug.

I could make the button run a cleaner script, and then the script defines the behavior (possibly with options in the main rq config file).

[bwitt]

We have a cron that cleans them after 2 weeks. Yeah maybe just run the cleaner script.