Fix: Periodic slots are not repeated in graphs [5495] (2)
Bug Number: 5495
Release notes (y/n): Yes
For Release Nums: 6.5

This, and the prior commit, provide a revised implementation for plotting 
periodic slots.  This addresses Gnats 5495.  With these changes, Periodic 
Slots ALWAYS fill the plot's visible time range.

(Suggested demonstration: In a plot page including Periodic Slots, try 
holding down the Left and Right arrow buttons to repeat-scroll forward and 
backward in time.  The Periodic Slot data is shown across the full time 
range. Always.  Note: As indicated in the tooltip on those buttons, also 
holding down the Shift key while pressing the mouse button on those those 
arrow buttons scrolls _more rapidly_).

We had _considered_ removing the Periodic Slot Curve's "Time Range" options 
in the curve configuration dialog.  See the first of these screenshots:

  http://cadswes2.colorado.edu/~philw/2014/bugs/5495/Ref3B.png
  http://cadswes2.colorado.edu/~philw/2014/bugs/5495/Ref2.png 

However, this was retained.  But these changes were made:

  (1) BUG FIX: When bringing up the Periodic Curve Configuration dialog, 
      the "Default" Time Range setting was always shown as selected -- 
      even if the "Specify Time Range" choice was internally active.  
      This led to very confusing behavior.

  (2) The "Specify Time Range" dates no longer represent the range of the 
      plotted curve.  Instead it just imposes a minimal time range for the 
      overall plot when AUTO-SCALING is applied.

The following is now the plot's Auto-Scaling algorithm for plots containing 
Periodic Slots:

  (1) The new time range includes the full time ranges of all of the 
      plot's series slots.
  (2) The new time range also includes the ENABLED "Specified Time Ranges" 
      from the plot's Periodic Slot Curves.
  (3) If neither of the prior two types of items provide a time range 
      (no series slots or specified time ranges from periodic slots), 
      the auto-scaled time is the model's run period.

These changes DO NOT accommodate a new requirement mentioned by David in 
the context of the bug model's plot ... "The plot TVA actually wants to see 
would have a range from 1/1/14 to 12/31/14."  

I understand this is to be an automatic and dynamic application of the 
"current water year*" -- ideally (I believe) not requiring the user to 
apply the "AUTO-SCALE" operation.  I have a question about whether the 
current water year is (a) the wall-clock water year, (b) the water year 
containing the beginning of the run period, or (c) the water year 
containing the end of the run period.  If it's reasonable to actually 
require an "AUTO-SCALE" operation to update this (minimal?) dynamic time 
range specification, this mode of operation _could_ be added as a third 
choice in the Periodic Slot Curve's "Time Range" settings.  Alternatively, 
this could be a setting on the overall Plot Page. I propose that all of 
this be worked out as an enhancement apart from Gnats 5495.

*The RiverWare Water Year is a model-wide setting accessible from the 
Simulation Controller's Run Configuration.  The water year can start at 
the beginning of any month.  Here is a screenshot of that configuration, 
and its current application. (See the bottom of the first dialog):

  http://cadswes2.colorado.edu/~philw/2014/bugs/5495/WaterYear.png

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