Allow linking of contour map views

* Place copy of contour map in correct collection
* Allow linking of contour maps
* Improve handling of contour views and 3D views
* Guard nullptr
* Guard assert seen on Linux
* Zoom all on contour map when unlinked to reset zoom
If a contour map is linked to a 3D view, the view can get distorted. Call ZoomAll to reset to sensible defaults.

* Remove default rainbow legend

ApplicationLibCode/ProjectDataModel/RimProject.cpp

@@ -755,7 +755,7 @@ void RimProject::allNotLinkedViews( std::vector<RimGridView*>& views )
     std::vector<RimGridView*> alreadyLinkedViews;
     if ( viewLinkerCollection->viewLinker() )
     {
-        viewLinkerCollection->viewLinker()->allViews( alreadyLinkedViews );
+        alreadyLinkedViews = viewLinkerCollection->viewLinker()->allViews();
     }
 
     for ( size_t caseIdx = 0; caseIdx < cases.size(); caseIdx++ )