Allow dataobject duplication

Goal

I want to duplicate a dataobject in order

• Not to start from scratch
• To modify it slightly
• To keep the original (generally for comparison purpose)

Problem

If my original data is stored in the RDDMS, I have to pay

• The pull
• The copy
• The push

Remarks after presentation at Reservoir meeting today

• Ok but the ETP message should allow recursive copy based on source (e.g. copying a representation would also copy its properties but not its property types) + a filter on datatype (e.g. I should be able to only copy Triangulated representations of an interpretation)
• A new subprotocol (StoreOSDU) would be proposed containing a single message for now. It would still be experimental because we expect some other ETP messages to come in this extended Store subprotocol.
• Philippe has to provide an AVRO schema proposal.