RimWellRftPlot: add detachFromDockPermanently(), which removes the plot from its dock
and discards the window controller for good (unlike removeWindowFromDock(), which must
leave the controller intact so the window can be re-docked later). RimWellRftPlot no
longer docks itself in its constructor, since it can also be embedded as a non-dockable
child of another plot. RicCreateRftPlotsFeature now explicitly calls dockAsPlotWindow()
for its stand-alone RFT plot to preserve existing behavior.
RimRftCorrelationReportPlot: use detachFromDockPermanently() instead of
removeWindowFromDock() for its embedded RimWellRftPlot, and re-apply that detachment in
initAfterRead(), since the PDM factory bypasses the constructor when restoring child
plots from a project file.
Magne Sjaastad
Jon Jenssen
Kristian Bendiksen