RiverWare Slot Viewer
Bug Number: n/a
Release notes (y/n): Yes
For Release Nums: 7.2

See original analysis and design document:
http://cadswes2.colorado.edu/~philw/2017/SlotViewer/SlotViewerAnalysis2.html

This is a squash merge (single commit) of the "SlotViewer2" development branch.

Significant implementation modules:

   Q3GUI/SlotQtDlg  (a QMainWindow)
   Q3GUI/SlotDataTableModel  (a QAbstractTableModel)
   Q3GUI/SlotDataTableView  (a QTableView)

Also, notable changes in:

   Q3GUI/Workspace
   Q3GUI/SlotQDlgSlotData

New class: Sim/SlotViewerConfig ...

The SlotQtDlg class needs a Root subclass instance with which to discern its 
application (Open Slot Dialog, Edit Account Dialog, Slot Viewer, etc).  
SlotViewerConfig is an empty Root subclass used for this purpose.  In the 
future, if we DO introduce any persistent settings for the SlotViewer, that 
data would be encapsulated in this SlotViewerConfig class.

// Note [7-2017, RW 7.2]: The initial implementation of this class is just
// a stub. The initial requirements for the Slot Viewer do not require any
// state information outside of the GUI. (Even its list of SlotColRefs is
// ephemeral -- not retained when the dialog is closed).

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