Czkawka GUI - Add possibility to select duplicates by path

[siodor]

When going through the list, there might be duplicates from various path. Some are deliberate (e.g. backups), some are real duplicates.

Select should have "Select all beneath path" and then there should be a path selection dialogue and/or path entry field. Same for "Select all except beneath path".

Of course CLI could also profit from this but I guess with piping, etc. such path selections could be automated in CLI.