Add Element for the root

Fix import schema location

Entity:
	replace relatedEntity with EntityRelationship class

EntityRelationship:
	add entity of type Entity, 1...1

Clinical Statement:
	replace relatedClinicalStatement with ClinicalStatementRelationship class
	replace relatedEntityInRole with ClinicalStatementEntityInRoleRelationship class

ClinicalStatementRelationship:
	add clinicalStatement of type ClinicalStatement, 1...1

ClinicalStatementEntityInRoleRelationship:
	add entity of type Entity, 1...1

=== for Packaging in ballot format ===
for sample XMLs, adjust schema paths with ..\Schemas\ prefix to note new relative location of schemas in ballot package format