#828 Report on actions

[mel]

Hi,
I want to suggest an addition to many of existing function : a report (a "log") after some actions are finish.
- Linked files : so I will know which pdf was added/removed. Or colored newly linked entries (like after import), so I know which files I should add XMP metadata.
- Find unlinked files : currently, it says "x files couldn't be added" but I have no idea which ones
- Write metadata : errors are written but only during the process. Would be interesting to have the recapitulation of all errors when job is finish

Thanks