Saved search: add modified search
This was suggested on the mailing list:
It would be great to ad an option to the Saved Search that make possible
to search only modified photo.
To expand on the idea a bit, we could have options for:
- Is/not modified
- Is/not modified within Shotwell (using our editing tools)
- Is/not modified with external program
Where the first option would be the second two ORed together.