revert: issue "no changes needed" message for files missing on both side
When a file was marked as removed in the working copy and did not existed in the
target of the revert, we did not issued any message pointing that no change was
needed to the file (implicitly saying that revert had changed the file).
We now properly issue a message in this situation. Tests change in and handful
of case where the message was documented as missing.
Greg Ward, author of the original bfiles extension
Na'Tosha Bard of Unity Technologies
Fog Creek Software
Special thanks to the University of Toronto and the UCOSP program