Add onDelete='CASCADE' to fks in network tables (other than updatedBy)
Move Node and Edge to model
Create a workspace impl
Create the first non-update trigger
WorkspaceSnapshot work
Merge branch 'foreign_key_constraints'

Conflicts:
	model/src/main/java/com/chiralbehaviors/CoRE/agency/AgencyNetwork.java
	model/src/main/java/com/chiralbehaviors/CoRE/attribute/AttributeNetwork.java
	model/src/main/java/com/chiralbehaviors/CoRE/attribute/unit/UnitNetwork.java
	model/src/main/java/com/chiralbehaviors/CoRE/coordinate/CoordinateNetwork.java
	model/src/main/java/com/chiralbehaviors/CoRE/event/status/StatusCodeNetwork.java
	model/src/main/java/com/chiralbehaviors/CoRE/location/LocationNetwork.java
	model/src/main/java/com/chiralbehaviors/CoRE/network/RelationshipNetwork.java
	model/src/main/java/com/chiralbehaviors/CoRE/product/ProductNetwork.java
	model/src/main/java/com/chiralbehaviors/CoRE/time/IntervalNetwork.java