Output Config Dialog / Plotting -- Basic data model and GUI changes to 
support CHECKABLE Snapshot Object Items to indicate which Snapshot Slots
to include in generated plots.

----------------
Sim/PlotInfo.cpp
Sim/PlotInfo.hpp
----------------

Changed field name:
  OLD: bool _snapshotState;
  NEW: bool _includeSnapshots;

Added field:
  QList<QString> _activeSnapObjNames;

--------------------
Sim/PlotPageInfo.cpp
Sim/PlotPageInfo.hpp
--------------------

Renamed methods / changed list type -- OLD:
  bool getSnapshotState(int row, int col);
  void setSnapshotState(int row, int col, bool state);
  cwDlist<SnapShotObj*> getAllSnapShotObjects(int row, int col);

Renamed methods / changed list type -- NEW:
  bool getIncludeSnapshots (int row, int col) const;
  void setIncludeSnapshots (int row, int col, bool doInclude);
  QList<SnapShotObj*> getAllSnapShotObjects (int row, int col) const;

New methods:
  QList<QString> getActiveSnapObjNames (int row, int col) const;
  void setActiveSnapObjNames (int row, int col, const QList<QString>&);
  void appendActiveSnapObjName (int row, int col, const QString&);

-----------------
Sim/cwGraph.cpp
Sim/cwGraph.hpp
Sim/cwPlotter.cpp
Sim/cwPlotter.hpp
-----------------

Changed list type:
  OLD: cwDlist<SnapShotObj*> getAllSnapShotObjects();
  NEW: QList<SnapShotObj*>   getAllSnapShotObjects();

-----------------------
Sim/cwSlotSetOutput.cpp
Sim/cwSlotSetOutput.hpp
-----------------------

Changed field name and type:
  OLD: int _snapshot_state;
  NEW: bool _includeSnapshots;

Changed list type:
  OLD: cwDlist<SnapShotObj*> getAllSnapShotObjects();
  NEW: QList<SnapShotObj*>   getAllSnapShotObjects();

Changed method names and type:
  OLD: virtual int getSnapshotState();
  OLD: virtual void setSnapshotState(int state);
  NEW: virtual bool getIncludeSnapshots() const;
  NEW: virtual void setIncludeSnapshots(bool doInclude);

-----------------------------
Q3GUI/OutputConfig.cpp
Q3GUI/OutputConfig.hpp
Q3GUI/OutputConfigWidgets.ui
-----------------------------

Significant Layout Cleanup Work. 

Important new widgets in UI file:

  QGroupBox*   _descriptionGroupBox;
  QWidget*     _snapshotButs;
  QPushButton* _allSnapsButton;
  QPushButton* _invertSnapsButton;

  OLD: Q3TextEdit* _textDescription;
  NEW: QTextEdit*  _textDescription;

New methods:
  void descriptionGroupBox_clicked (bool);
  void allSnapsButton_clicked();
  void invertSnapsButton_clicked();

------------------
Q3GUI/SlotPlot.cpp
------------------

Client changes for PlotInfo change.

==========================

Short Description: Utilities for QTreeWidgets with "checkable" items
Bug Number: (part of addressing Gnats 4744)
Release notes (y/n): no
For Release Nums: 5.3

--------------------
Q3GUI/RwQt4Utils.hpp
Q3GUI/RwQt4Utils.cpp
--------------------

New utility functions for QTreeWidgets with "checkable" items:

  QList<QTreeWidgetItem*> checkedItems (const QTreeWidget*, int col);
  void setCheckedAllItems (QTreeWidget*, int col, bool doCheck);
  void invertCheckedAllItems (QTreeWidget*, int col);

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