GitHub #197: Fix signal vias directly to Patch DSP inlets
GitHub #197: Fix indexing error in finding DSP inlet object
GitHub #197: Be more graceful if other endpoint does not resolve
GitHub #192: Updates to [smix] and supporting code

* Fix bug where changing scope name of a layer in GUI did not propagate
* Fix bug in patch.py which prevented exporting a Patch interface within
  another Patch
* Fix annoying message on load about skipping "patch" object
* Always make sure there's at least 1 inlet in a Processor