Bug 14686: Add Upload to Tools menu

Bug 14686: Add Upload to Tools menu

This patch makes sure that the added granular permissions work as
advertised.

Note: The field owner was not included in the Koha::Upload->get response.
The code to verify if a user is allowed to delete an upload, is concentrated
in the template now. When get returns a Koha::Object, this check could be
relocated.

Test plan:
[1] Verify that the current user has permission for tools, or has
    at least upload_general_files.
[2] Do you see Upload in the Tools menu? Follow the link.
[3] Upload a permanent file (with a category).
[4] Do you see the Delete button in the results form?
[5] Make sure that another user has no permission to upload.
[6] Login as that user and check the Tools menu.
    Try the URL [yourserver]/cgi-bin/koha/tools/upload.pl
    You should have no access to the upload form.
[7] Enable upload_general_files for this user. Go to upload and search for
    the upload from step 3. You should not see a Delete button.
[8] Enable upload_manage for this user. Search for the upload again.
    Delete the upload.
[9] Go to upload via the Cataloguing editor (856$u plugin) or add
    parameter "plugin=1" to the URL. You should not see the Tools menu.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Mirko Tietgen <mirko@abunchofthings.net>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan Gallagher <bredan@bywatersolutions.com>