Autogenerate sequence_id for ispartof as an Admin Option

[DiegoPino]

What?

During process time (Form option) we could add the sequence_id to ADOs connected via ispartof automatically

This is a hack and SHOULD not be assumed as a blind option. But might be useful for large sets coming directly and already in order from Solr.

@karomabiles @alliomeria

This should work for both empty sequence_id columns and not existing. THIS WILL OVERRIDE VALUES ALREADY PRESENT

[alliomeria]

and there was much rejoicing! awesome, this will so great to have automatically generated @DiegoPino!