OutCanv items in Workspace: OutputCanvasConfig::findNodeByInstance optimization
Bug Number: n/a
Release notes (y/n): no
For Release Nums: 7.1

The OutputCanvasConfig method findNodeByInstance -- used to find a COPY (or 
'original') of a given OutputCanvasNode in a different OutputCanvasConfig 
instance -- can be much more efficient if we also provide the NodeType.
This change has been made:

  OLD: OutputCanvasNode* findNodeByInstance (int instanceNum) const;
  NEW: OutputCanvasNode* findNodeByInstance (NodeType, int instanceNum) const;

Minor: The name of the templated local "helper" function was renamed so that 
the public function uniquely 'greps'.

  OLD: findNodeByInstanceInNodeList()
  NEW: findNodeInstInNodeList()

Also, in findNodeByInstance, we were redundantly searching in 'allPolyLines' 
as well as 'allFlowLines' and 'allCanvasLines'.  OutputCanvasConfig::PolyLine 
is the common base class of ...FlowLine and ...CanvasLine.  I removed the 
PolyLine search.  (It would have been equally valid to instead remove the 
other two).

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