Tabular Series Slot Report: Omit Slots Zero/Nan Value Filter now uses Limit Timesteps range [5696]
Bug Number: 5696
Release notes (y/n): Yes
For Release Nums: 6.8 (release)

Gnats 5696: Tabular Series Slot Report not omitting slots properly

The Tabular Series Slot Report supports the following configurations 
(among many others):

   [x] Limit timesteps
      Start: [timestep date/time spinbox]
      End: [timestep date/time spinbox]

   [x] Omit slots
      (o) Having only NaN values
      (o) Having only NaN or 0.0 values

Slots having non-zeros/NaNs ONLY OUTSIDE of the limited time range were not 
being omitted.  They were being included in the report, even though only 
zeroes/NaNs were being displayed (i.e. within the specified Limit timesteps 
time range).  With this fix, such slots are now correctly omitted.

The changes are primarily in these two methods:
  bool GreenBookReportConfig::SlotRec::anyValidValues (const GreenBookReportConfig*) const;
  bool GreenBookReportConfig::SlotRec::anyNonZeroValues (const GreenBookReportConfig*) const;

During final testing, a conditionally-dependent "one off" error was 
discovered in the non-Single-interval choices of the "Group timesteps into 
intervals" configuration settings.  If the final interval started on the 
"Limit timesteps" END date/time, that last timestep had been mistakenly 
omitted.  See change in method:

  void GreenBookReportDoc::generateReportPages (cwostream& os, bool isHtml);

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