Fix: SCT display out of alignment after changing configuration [6029]
Bug Number: 6029
Release notes (y/n): Yes
For Release Nums: 7.1.5 and 7.2

Gnats 6029: SCT display out of alignment after changing configuration.

We've had quite a bit of difficulty forcing Qt5 QTableViews to refresh, after 
our recent upgrade from Qt 4.8.5 to Qt 5.5.1.  Perhaps because of hidden table 
columns for the support of SCT "Sheets", a bug is showing up [Gnats 6029]
in which OUR ATTEMPT to refresh the table is causing the initial columns to 
be drawn, as if the horizontal scrollbar position is all the way to the left 
(at its zero position) -- i.e. even if it isn't.

A workaround fix for this problem is implemented in method SctTableModel
::updateAll().  If the SCT Data Table's horizontal scrollbar is at a position 
other than zero, we scroll it to zero for the refresh operations, and then 
restore it to its original value.

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