Grid Cross Plot: Use the term Grouping instead of Categorization

ApplicationCode/ReservoirDataModel/RigGridCrossPlotCurveGrouping.h

@@ -0,0 +1,27 @@
+/////////////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (C) 2019- Equinor ASA
+//
+//  ResInsight is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
+//  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//  FITNESS FOR A PARTICULAR PURPOSE.
+//
+//  See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
+//  for more details.
+//
+/////////////////////////////////////////////////////////////////////////////////
+#pragma once
+
+enum RigGridCrossPlotCurveGrouping
+{
+    NO_GROUPING,
+    GROUP_BY_TIME,
+    GROUP_BY_FORMATION,
+    GROUP_BY_RESULT
+};
+