Option to add suffix to saved file

[Paul Matthijsse]

In batch queue I have the possibility to use a template to name my exported files, using %p1/%f_art for example. This results in DSC_1000_art.tif. I would like to have this option standard in the Save dialog, like in Darktable $(FILE_FOLDER)/$(FILE_NAME)_dt.

Convenience: easy to tell if a raw was processed with Darktable, Art of RawTherapee. For RT and Art I still have to name them manually by adding _art or _rt.

[agriggio]

in the save dialog, the user selects the name. There's no templating logic in there, I won't change this, sorry