adapted ORMNodeChangeBoundariesCommand to the graphical model
adapted ORMNodeCreateCommand to the graphical model
adapted ORMCompartmentFactory, ORMGroupFactory, ORMRoleGroupFactory,
ORMRoleTypeFactory and ORMNaturalTypeFactory to the graphical model
adapted ORMAddCommand to the graphical model
adapted ORMOrphanChildCommand to the graphical model
deleted ORMRoleModelCreateCommand, because it's no longer necessary