Bug 32603: Suggester category in Suggestions management

Bug 32603: Suggester category in Suggestions management

In Suggestions management, in the table displaying all suggestions, add
a column to display suggester category. This way, it is possible for
example for the librarian managing suggestions rather to prioritize
suggestions coming from teachers than those coming from students.

TEST :

1. Apply the patch.
2. Acquisition > Suggestions.
3. There is a new column 'Suggester category'. It can be
   displayed/hidden.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>