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>