OutCanv in WS: OutputCanvasConfig software engineering revisions [Phil]
Bug Number: n/a
Release notes (y/n): no
For Release Nums: 7.1

The following modifications were makde to the Sim/OutputCanvasConfig class:

(1) The OutputCanvasNode now fully encapsulates the following.
    This was made possible with the addition of a copy constructor.

  (a) Maintenance of _instanceNum fields.  This field is now 'const'.
  (b) Copying of the three workspace coordinate fields (three QPointF members).

(2) Changed OutputCanvasConfig "copy workspace coordinates" from a 
    two-parameter static method, to a single-parameter mutator method.

  OLD: static void copyWorkspaceCoordinates(OutputCanvasConfig*, OutputCanvasConfig*);
  NEW: void copyWorkspaceCoordinatesFrom (const OutputCanvasConfig*);

(3) Added 'const' to several accessor methods.

(4) Resolved the few compilation warnings in this module.

(5) Recoded the following two methods to avoid the need to build a unified 
    base-class OutputCanvasNode list.  Each of these now makes use of a 
    templated local helper function (respectively defined above each of 
    these two methods).

  (a) void OutputCanvasConfig::copyWorkspaceCoordinatesFrom (
         const OutputCanvasConfig* fromConfig);

  (b) OutputCanvasNode* OutputCanvasConfig::findNodeByInstance(
         int instanceNum) const;

... these are the helper function declarations:

  // local function
  template <class NodeType>
  static void copyWorkspaceCoordinatesToNodeList (
                 const OutputCanvasConfig* fromConfig,
                 const QList<NodeType*>& toNodeList);

  // local function
  template <class NodeType>
  static OutputCanvasNode* findNodeByInstanceInNodeList (
                 const int instanceNum,
                 const QList<NodeType*>& nodeList);

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