changed refrencedRelation to a list
renamed CreateActionOperationAction to CreateAttributeOperationAction
and fixed erros CallRelationshipConstraintsActionCommand,
ConstraintsDialog, RelationshipConstraintsAction,
ORMRelationCreateCommand and ORMRelationshipConstraintDeleteCommand
genrated test skeleton for RelationshipConstraintsAction,
ORMRelationshipConstraintDeleteCommand and ORMRelationCreateCommand