Bug 11666: add permission check for MARC framework import/export

Bug 11666: add permission check for MARC framework import/export

This patch makes the MARC framework import/export script require
that the staff user be logged in with appropriate permissions for
managing the MARC frameworks.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
I can confirm the bug and the solution. After applying the patch
downloading the file without logging in first is no longer possible.
Also passes tests and QA script.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit 03d4ed2468bb9ab97b1f7b7d9e29507dc815a8b3)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>