SCT: added 6-hour time dividers (similar to 4-hour dividers)
Bug Number: n/a
Release notes (y/n): Yes
For Release Nums: 6.6

Previously, the SCT supported optional time dividers between the following 
intervals: 4-Hour, Day, Weekend, Month and Year.  With this addition, 
optional 6-hour time dividers are now supported.  They use the same 
user-configurable color as 4-Hour dividers, and only 4-hour or 6-hour 
dividers can be supported at any given time in each of the two axis 
orientations.  These screenshots show the new and changed configuration 
options in the SCT configuration dialog:

    http://cadswes2.colorado.edu/~philw/2014/SCT/Dividers/SixHour.png 

This was added to address a new TVA requirement.  Here are two versions of 
a mockup for a major enhancement being planned.  The latter shows the 
desirable dividers -- 6 hour intervals in an hourly model:

    http://cadswes2.colorado.edu/~philw/2014/TVA/FEWS/SctMockup1.png
    http://cadswes2.colorado.edu/~philw/2014/TVA/FEWS/SctMockup2.png

For the time being, this new configuration is coded to be downward compatible 
with RiverWare 6.5 when 6-hour dividers are not used.  That is, an SCT saved 
from RiverWare 6.6 development will load in RiverWare 6.5 (but only if 6-hour 
dividers are not used).  This is a function of this code in method: okstat 
SctConfig::dump (cwostream &os, bool slotsToo /*=true*/) const ...

 // Temporarily Conditional (6-2014), For now, keep SCT's downwardly
 // compatible with RiverWare 6.5 when these new options are not used.
 // This condition can be removed, e.g. before the RiverWare 6.6 release.
 //
 if (_mark6HourRowDividers || _mark6HourColDividers)
 {
    os << "  MARK_6HOUR_ROWDIV " << bstr (_mark6HourRowDividers) << endl;
    os << "  MARK_6HOUR_COLDIV " << bstr (_mark6HourColDividers) << endl;
 }

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