* cleanup: remove debugger calls
* cleanup: remove dead =begin ... =end
* vc_dvportgroup: add 'create' message with properties
* vc_dvportgroup: allow custom property a voice: use (is|should)_to_s in change_to_s
* vc_dvswitch: fixup_is: fix bad type matching
* vc_dvswitch: allow custom property a voice: use (is|should)_to_s in change_to_s
* abstract types: handle conflicting property keys in concrete subtypes
  with ABSTRACT2, :node_types
* modify defined types, maps, test manifests for ABSTRACT2