Default revision field in dataset serializer

When globus times out (which happens too often) the exist flag is set to False for files which actually exist

Revert change in delete_local

* Revisions now extracted from file path, no longer provided as a separate field
* Revisions are defined as any directory within the session folder that starts and ends with a pound sign
* Error status is returned if either a revision folder contains a subfolder or there are multiple revisions
* There is no longer a difference between a collection in the path field and a collection within the filename
* Registering a file that already exists will not return an error status
* Can now get a revision record by name, i.e. GET /revisions/<name>

Report page