CoeSwd6: Plotting: User Def Axis Units: Marker Dialog Crash Fix.
Bug Number: n/a
Release notes (y/n): no
For Release Nums: 7.1

A crash was discovered in the (Plot-) Marker Configuration dialog after 
the recent RW 7.1 development, a major enhancement to allow user 
configuration of plot axis units (within their automatically-assigned 
unit type).

The crash was reproducible with the following sequence:

  (1) Load a copy of 
  http://cadswes2.colorado.edu/~philw/2017/bugs/PlotMarkerCrash/MarkerCrash1-71.mdl

  (2) Edit Plot Page: Mead Marker Plot

  (3) In Plot Page Editor: "Markers" button 
      ... select "Mead Store Peak" marker ... "Edit Marker" 
      ... leave BOTH the Marker Plot Manager AND the Marker 
      Configuration dialog open.

  (4) In Plot Page Editor: "Axes" button ... Use Custom Settings 
      ... change "acre-feet" to "ML" ... Apply.

  (5) In the Marker Configuration dialog: click "Apply" 
      ... crash executing in a bad (no longer allocated) QwtPlotMarker. 
      See the following stack:

 riverware.exe!QwtPlotMarker::setLineStyle(QwtPlotMarker::LineStyle style)
 riverware.exe!MarkerDlg::applyChanges()
 riverware.exe!MarkerDlg::applyClicked()
 riverware.exe!MarkerDlg::qt_static_metacall(QObject*, QMetaObject::...
 ... ... ...

This was fixed by having the Marker Configuration dialog register 
for 'plotMarkerDeleted' Qt signals emitted from the containing 
SlotPlot (qwtPlot).  The generation of that Qt signal from SlotPlot 
was picked up from other new development.
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