Bug 35044: Admin: New additional fields 'repeatable' field

Bug 35044: Admin: New additional fields 'repeatable' field

There is now a new 'repeatable' checkbox when configuring
(adding or editing) an additional field for a specific table.
It is also displayed in a column in the additional fields panel
for a given tablename.

MARC fields are not allowed to be repeatable.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>