(#396) Save/Restore of WellLog plots partly in place.

Cleaned up ownership in WellLog plot classes
initAfterRead() is implemented
moved code related to command features from the WellLog classes
Still plots are not redrawn/reloaded when opening a project file.

ApplicationCode/UserInterface/RiuWellLogPlot.h

@@ -42,7 +42,7 @@ public:
     RiuWellLogPlot(RimWellLogPlot* plotDefinition, QWidget* parent = NULL);
     virtual ~RiuWellLogPlot();
 
-    RiuWellLogTracePlot* createTracePlot();
+    void insertTracePlot(RiuWellLogTracePlot* tracePlot);
 
     void setDepthRange(double minDepth, double maxDepth);