Bug 14686: Add two granular permission for upload under tools

Bug 14686: Add two granular permission for upload under tools

[1] Upload_general_files
    This will allow you to access the tools/upload form via the Tools menu.
    And it will also allow you to add permanent uploads.

[2] Upload_manage
    It will allow you to delete uploads from other users.
    Note that anyone may delete his own uploads.
    It is not meant to include upload_general_files.

In order to not disturb existing users that now have edit_catalogue and are
using the plugin (read: added at least one record to uploaded_files), we
will add the first permission for them. New users will need to be authorized
in the usual way thereafter.

Note: If you only have one of the other permissions checked in allows_add_by,
e.g. stage_marc_import, you can add temporary uploads, but not permanent
uploads.

Test plan:
We are only testing the dbrev here, not if the perm works as advertised.
[1] Run the dbrev and check that you see the perms with a description on
    the Patron/Set permissions page.
[2] If you had records in uploaded_files and a user with edit_catalogue
    *only*, verify that this user now also has upload_general_files.

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>