This patch adds the table of items on additem.pl to the columns
customizer.
Test plan:
1. Open item editor on a record, and verify that all columns are visible.
2. Apply patch.
3. Reload editor, and verify that column visibility hasn't changed.
4. Open "Hide/show columns," and verify that you can add and remove
columns.
5. Change the visibility and togglability of some columns in
columns_settings.pl, and verify that these correctly apply to
additem.pl.
NOTE: The columns that are configurable are selected from the non-hidden
columns that have mappings to MARC subfields in the default MARC21
framework (and can thus be displayed in the item editor).
Signed-off-by: Jenny Schmidt <jschmidt@switchinc.org>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@unc.edu.ar>
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