Slot Viewer: Exclude and REMOVE slots not (or no longer) having run's timestep size
Bug Number: n/a
Release notes (y/n): no
For Release Nums: 7.2

The following method was enhanced to exclude slots not having the same 
timestep size as the Run:

   bool SlotQtDlg::slotViewer_slotSupported (SlotColRef scRef);

Additionally the following method was added.  This removed slots which no 
longer meet the criteria checked by that 'slotSupported' method.  This new 
method is called in the processing of SERIESSLOT_SERIES_CHANGED callbacks, 
in the SlotQtDlg::slotCallbackHandler() method.

   void SlotQtDlg::slotViewer_removeUnsupportedSlots();

ALSO: In the Open Slot dialog's TOOLTIP on the Slot-Type Icon button is 
updated in response to that callback.  Only if the passes the 'slotViewer_
slotSupported' criteria, the tooltip shows this text as a 2nd line:

   "Drag icon to drop into Slot Viewer"

---