#535 Generationof filenames

[skinny]

Possibility to change the default format for naming files, i.e.

Lastname1 (YYYY) Title.pdf
Lastname1 and Lastname2 (YYYY) Title.pdf
Lastname1 et al. (YYYY) Title.pdf

instead of just bibtexkey.pdf

A button menu option called 'Generate file name' could also be nice in addition to the automated function when you drag and drop files.'

Thanks for JabRef!

Martin