Feature request: Dialog for assigning subject to subject groups should show more data columns

[fsando]

The dialog for assigning subjects to subject groups only show three columns are visible: "Name" (essentially subject-id), "Template" (name of the template), "Species". This makes it vary hard to select the correct subjects for group assignment.

It would therefore be an important improvement if more columns could be shown, especially if data could also be sorted according to one or more columns.

Steps to replicate:
At the "study / subjects / design" page
Either create a new subject group: click "Add subjectgroup" or double click one of the existing groups.
In the dialog (see attachment) shows only three columns.