TableSlot Plotting: Optional Automatic Placement of the Vertical Distance 
  Entity on the Vertical Axis. [6-23-2009].
SEE: http://cadswes2.colorado.edu/~philw/2009/PlotAxisVertDistDefault/

-------------
Sim/SimWS.hpp
Sim/SimWS.cpp
-------------

Added flag to Sim library Workspace object to indicate whether or not
the default arrangement of axis for two-column table slots should be 
overridden to put the vertical distance entity on the vertical axis.

  // Misc. preferences saved with model
  bool _overrideDefaultPlotAxesForVertDist;  // default: false

  // Misc. preferences saved with model
  bool overrideDefaultPlotAxesForVertDist() const 
        { return _overrideDefaultPlotAxesForVertDist; }
  void setOverrideDefaultPlotAxesForVertDist (bool);

Model file persistence for this new flag:

  In SimWorkspace::dump (cwostream& os):
    os << "OverrideDefaultPlotAxesForVertDist "
       << (_overrideDefaultPlotAxesForVertDist ? "1" : "0") << endl;

  New method:
    int overrideDefaultPlotAxesForVertDistCmd (ClientData, 
                                Tcl_Interp *interp, int argc, char *argv[]);

  Tcl_CreateCommand (rwInterp, "OverrideDefaultPlotAxesForVertDist", 
                     overrideDefaultPlotAxesForVertDistCmd,
                     (ClientData) NULL, NULL);

--------------------
Q3GUI/AxisDlg.cpp
Q3GUI/AxisDlg.hpp
Q3GUI/AxisDlgBase.ui
--------------------

Addition of toggle to support the optional automatic placement of the vertical
distance entity on the vertical axis.

  +-- Auto Swap Axes -------------------+
  |                                     |
  | [X] Place single vertical distance  |
  |     column entity on vertical axis  |
  +-------------------------------------+

New widgets:
  Q3GroupBox* _autoSwapAxesBox;
  QCheckBox*  _axesVertDistOverrideCheckbox;

New Qt slot (signal handler):
  void axesVertDistOverrideToggled (bool);

--------------------
Q3GUI/SlotCurve.cpp
--------------------

Change to method:
  SlotCurve* SlotCurve::createSlotCurve(QwtPlot *parent, Slot *slotPtr, 
                           int xColumn, int yColumn, int zColumn, ....)

  ... in the case of plots for two-column TableSlots where the axes
  have not yet been assigned, reverse the default assignments based 
  on these method calls:

    rwWorkspace->overrideDefaultPlotAxesForVertDist();
    SlotGUIUtils::slotColIsProbablyVerticalDistance (tableSlotPtr, 0);
    SlotGUIUtils::slotColIsProbablyVerticalDistance (tableSlotPtr, 1);

----------------------
Q3GUI/SlotGUIUtils.cpp 
Q3GUI/SlotGUIUtils.hpp
----------------------

Change to method:
  bool SlotGUIUtils::slotColIsProbablyVerticalDistance (const Slot*, int col)

  ... if the column label is BLANK (and it has a unit type of LENGTH), regard 
  that as a vertical distance entity. This is needed for these two TableSlots 
  which lack column labels:

    [Power Reservoir] Net Head vs Generator Capacity
    [Power Reservoir] Net Head vs Plant Efficiency

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