Pie Charts: White Background for Print and Image Export
Bug Number: n/a
Release notes (y/n): y
For Release Nums: 6.5

When printing and exporting the Chart dialog's image, the dialog's background
is temporarily set to white.  Previously exported and printed images had a 
grey background (as seen onscreen).  See samples -- before and after:

  http://cadswes2.colorado.edu/~philw/2013/PieChart/WhiteBg/chartExport64.png
  http://cadswes2.colorado.edu/~philw/2013/PieChart/WhiteBg/chartExportWhite.png
  http://cadswes2.colorado.edu/~philw/2013/PieChart/WhiteBg/StoragePieChart64.pdf
  http://cadswes2.colorado.edu/~philw/2013/PieChart/WhiteBg/StoragePieChartWhite.pdf

Changes which support white backgrounds for image export and printing are
in these methods:

  (1) void ChartDlg::exportImageHandler()
  (2) void ChartDlg::printImageHandler()

The background substitution is currently unconditional, based on these 
compile-time constants.  These could be changed to dynamic flags if we ever 
want to make this conditional:

  (1) static const bool EXPORT_WITH_WHITE_BACKGROUND (true);
  (2) static const bool PRINT_WITH_WHITE_BACKGROUND (true);

Some minor fixes were also applied (in the course of Phil's work to support Pie
Charts in Model Reports).

  (1) The Date/Time label was inconsistently formatted.  A zero reference 
   timestep size was being used when the chart's reference date/time was 
   active (instead of the date/time from a conditionally shown timestep 
   spinner).

  (2) The ChartConfigDlg had an exit crash involving slot callback deletions.
    ... NOTE: ChartDlg still has this sort of CRASH (exiting RiverWare when a 
       ChartDlg is open).

Several new methods to support Pie Charts in Model Reports are also being 
committed:

 (1) QPixmap ChartDlg::renderChart (const QSize& renderSize,
          const Date_Time* dateTimeOverride /*=NULL*/)
 (2) SlotColRef ChartDevice::firstSeriesSlotColRef() const;
 (3) QString ChartDevice::getDateTimeStr() const;

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