Improved uncommitted queue + filter in web UI

[isc-tleavitt]

A user should be able to commit:

• Files they have modified (e.g., uncommitted queue lists them as the user)
• Files they have deleted (need to track in uncommitted queue)
• Files modified without an owner listed (e.g., sc-list.txt)
• Files uncommitted with changes by another user AFTER confirming that they intend to

As part of the last point, the web UI should clearly display which files have uncommitted changes from other users. Files with uncommitted changes from the current user should be shown as they currently are.

It should also be possible to cancel another user's uncommitted change, but again with a prompt making sure the user really knows what they're doing.

[isc-tleavitt]

note: bullets 2 and 3 require API/back-end changes.