Bug 9701: Configure default indicator

Bug 9701: Configure default indicator

This patch adds the possibility to define default indicators in
the MARC frameworks. It adds 2 columns in the marc_tag_structure table in
the database in order to accomplish this. All files that reference this
table have also been updated to reflect these added fields.

Test: Add or edit a MARC framework. In the Field list should be 2 extra
columns. It should be possible to add default indicators (1 character)
    in these fields. Nothing else should have changed in the meantime.
    The default indicator values are not yet visible in the cataloguing module.

The default values are also loaded in the cataloguing form.

Test: Define default values in some MARC framework. Go to cataloguing
and create a new record using this framework. Verify that the defined
defaults are visible when set. Verify the default is empty (as before)
    if no default was set. Verify that if the default is changed, the
    record is saved with the manually changed value. Verify that upon
    changing such a new record, the manually set indicator value is used
    and not the default one from the framework.

Don't forget to run database and database schema update

Signed-off-by: Eugene Jose Espinoza <eugenegf@yahoo.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>