Bug 11319: Template modifications

Bug 11319: Template modifications

This patch add template modifications for the restrictions:
- the source field is always mandatory
- on move and copy, the source and destination subfield should be both
  filled or blank.
- on move and copy, the destination subfield should be filled.
- on update, the subfield value should be filled.

Test plan:
Verify you are not able to create/modify template actions according to
these restrictions.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>