Allow specification of action upon 'files equal'

[teleksterling]

This doesn't seem to have been suggested before, so I may be alone in this.

I'd like to be able to use FFS to delete files on one side if I have confirmed they're the same on both sides.

I'd like to use this in tandem with another requested feature, which is a filter by 'older than'.

[VincentFournier]

I am interested in this feature.
I would like to copy back equal files (full contents) from remote disk to my local disk when the timestamps different.
This happens when using git only locally and checking out old versions.
Vincent