Gnats 6063: Global Time Scroll is ignored when opening slots in the Slot Viewer [1]
Bug Number: 6063
Release notes (y/n): no, new development detail
For Release Nums: 7.2

The following two methods were attempting to preserve the "current row", 
but were failing because the display table had been rebuilt, so the table's 
current row wasn't defined.  (The table rebuild is a workaround for Qt 
QTableView and QHeaderView problems with conditionally showing and hiding 
particular rows and columns).

  (1) void SlotDataTableModel::selectCellsFromSelList()
  (2) void SlotDataTableModel::scrollToColumn (int col, bool selectToo)

The two methods now also consider the row of the dialog's DateTime Spinner 
in addition to the table's "current row".  If one is undefined, the other 
is used.  For application-reasons, the first method favors preserving the 
table's current row (if defined).  The second method favors the time row 
corresponding to the DateTime spinner.

These two new utility methods were added:

  (1) int SlotDataTableModel::curDateTimeRow() const;
  (2) int SlotDataTableModel::curDateTimeCol() const;

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