Slot Viewer: Certain supported slot types now INITIALLY open in their own dlg
Bug Number: n/a
Release notes (y/n): no (new development)
For Release Nums: 7.2

Previously, all slots which were supported by the Slot Viewer always opened 
up in the Slot Viewer.  All such slots could also be moved to their own slot 
dialog.  But we decided that CERTAIN such supported slots should instead 
initially be shown in their own dialog.

Currently this applies to:
  (1) MultiSlots with two or more subslots (i.e. two or more links)
  (2) RPL Expression Slots

This is now characterized with the second of these two predicates, 
static SlotQtDlg methods:

  static bool slotViewer_slotSupported (SlotColRef);
  static bool slotViewer_slotInitiallyShownInViewer (SlotColRef);  // ADDED

Also fixed: In a couple places where we were warning the user that they 
are about to open "MANY" (more that five) slot dialogs, we weren't taking 
into account that many slots now open up in a single dialog -- the Slot 
Viewer.  This "new dialog count" now correctly takes this into account.