Further Summary Multiplot improvements (#8707)

* Create a specialized summary plot page for showing multi plots
* Make summary plots always show in grid of selected size.
* Allow dragging summary addresses into empty main window area
* Limit grid to 4x4 cells

ApplicationLibCode/ProjectDataModel/Summary/RimSummaryNameHelper.cpp

@@ -86,10 +86,5 @@ QString RimSummaryNameHelper::aggregatedPlotTitle( const RimSummaryNameHelper& o
             RiuSummaryQuantityNameInfoProvider::instance()->longNameFromQuantityName( quantity, true ) );
     }
 
-    if ( title.isEmpty() )
-    {
-        title = "Plot Title";
-    }
-
     return title;
 }