added view_hierarchy function
added view_hierarchy function

Jonestj1/mbuild,summeraz/mbuild,sallai/mbuild,ctk3b/mbuild,iModels/mbuild,tcmoore3/mbuild,ctk3b/mbuild,tcmoore3/mbuild,iModels/mbuild,sallai/mbuild,Jonestj1/mbuild,summeraz/mbuild