Actions on multiple Folders

Add the ability to select multiple folders at once in the Folders section in the Library, with options to perform things on the selected folders via the right-click menu:

• Remove from browser

• Delete from disk

• Remove from Favorites

And if multiple folders are selected, maybe we could even show the combined set of images in the filmstrip.

Different but related: an option to remove all Folders from browser that are no longer on disk, with one click.