Bug 13492: Add the column configuration for the checkouts table - morember.pl

Bug 13492: Add the column configuration for the checkouts table - morember.pl

Test plan:
1/ Verify that you can show/hide columns on the checkouts table (moremember.pl).
2/ Play with the column configuration admin page (admin/columns_settings.pl),
and confirm the behavior is correct (depends on what you have selected).

Amended patch: replace 'un' and 'deux' with 'sort_order' and
'todays_or_previous_checkouts' in the yml file.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>