CoeSwd9: Incell editing for Marker Values [2]
Bug Number: n/a
Release notes (y/n): no
For Release Nums: 7.1

I simplified what I was providing for incell DateTime value editing for 
DateTime-value Plot Markers.  This now uses the Qt QDateTimeEdit widget 
(which is pretty good).

Also:
(1) Context menu operation:  Copy Slots (to slot clipboard) (slots of 
    the selected plots or curves).

(2) Grid setting nuance: Minor grid lines can't be enabled if major grid 
    lines are disabled.