Improve File Listing export of metadata

[bar_foo]

The File Listing function to export metadata from a group of files is extremely useful. I have two suggestions to improve it:

• Allow some way to save/export configurations of the metadata selected for export: I expect to have a variety of workflows for which different sets of metadata are needed, and it would nice not to have to recreate the setup each time, and to share the configurations with others.
• Make the field delimiter in CSV export configurable. Currently when exporting to CSV the delimiter is a colon, not the standard comma, and a lot of software has trouble handling it.