allow shared storage of styles and exported module presets via $datadir/darktable/
Currently you have to import styles into your DB before you can apply them. This is especially annoying when you want to ship collections of styles (like dtstyle.net). This would require the user to reimport each and every style, which btw means an user has to manually delete every style before importing the new version. And you can not really automate this step right now.
For packaging it would be easier if we could just drop files into $datadir/darktable/styles/ and $datadir/darktable/modulepresets/$modulename/ and have darktable pick up the styles from there on startup