#6344 - In Course>Users>Usergroups, add a action button for usergroups to have the preview list members

[chamilo-uga]

See #6344

the goal is to allow teachers to quickly have a full users list page of members of a class registered to a course.
It is a very simple and basic overview page with

list of users and a search bar.
It's voluntary on our part to have a sober large vertically scrolled page with no jqGrid and just a simple search bar on top.
There are 2 lists

    Students in class registered in course
    Students in class unregistered in course(*)

(*) a teacher can unregister from a course a student in a registered class in course.

We have information
    student firstname + lastname and email
    because users dont often know the username of a user in platform.
    It is easier for them to use email to check for homonymous