posting a comment gives status of 201 now.
posting a comment now returns 404

If the entry UUID doesn't exist or isn't accessible to the user, a 404 is returned.
posting a comment now returns 400

It returns 400 if the request body is incorrect.
posting a comment now returns 413

It returns 413 if reading in the request body causes it to run out of memory.
expanded donkey error responses

error_code has been expanded to handle return a specified status code when an error occurs instead of always returning 500.
list comments can now respond with 404

It will respond with a 404 if the entry identified in the URL doesn't exist, isn't a UUID or isn't accessible by the authenticated user.
retract/unretract comment can now respond with 404 when bad entry

It will respond with a 404 if the entry identified in the URL doesn't exist, isn't a UUID or isn't accessible by the authenticated user.
retract/unretract comment can now respond with 404 when bad comment

It will respond with a 404 if the comment identified in the URL doesn't exist or isn't a UUID.
retract/unretract comment can now respond with 400 when retracted param bad
retract/unretract comment can now respond with 409 when multi params

When the retracted query parameter is specified multiple times with different values, a 409 is returned.
metadata queries explicitly conv vals to strings.
CORE-5479 Revert "Removed the (authorized-avus) checks."

This reverts commit 25d7f9eb484f15054784ec6c94d93d01e34319bc.
refactored retract/readmit comment 403 checks
Merge branch 'dev' of https://github.com/iPlantCollaborativeOpenSource/DiscoveryEnvironmentBackend into dev
fixed retract/readmit comment bug

If the comment and entry both exist with the correct authenticated user permissions, if the comment isn't attached to the entry, a 404 is returned.
removed metadata korma entities
CORE-5479 Only filter ipc* attributes.

Updated donkey.services.filesystem.metadata/ipc-avu? to only check the attribute, and not the unit.
Minor refactor of donkey.services.filesystem.metadata/list-path-metadata.
Regularized the persistent comments interface
Regularized the persistent favorites interface

As part this change, `is-favorite` was renamed to `is-favorite?`.

Also, unneeded UUID conversions were removed.
Regularized the persistent tags interface