R1:1da691113aa8

Normalize the definition of "closed" revision statuses

Summary:
Currently, "Closed" and "Abandoned" are treated as "closed". I want to add a flag which treats "Accepted" as "Closed", too, for Asana and other companies who use an Asana-like workflow.

The background here is that their workflow is a bit weird. They basically do audits, but have a lot of things which Diffusion doesn't do well right now. This one change makes Differential fit their workflow fairly well, even though it's an audit workflow.

To…