Pcbnew: fix a python interface issue ( a not defined constant in some modules).

Was due to incorrect order of definitions in board.i interface.

pcbnew/swig/board.i

@@ -42,6 +42,7 @@ file near the top; only class BOARD functions go in board.i.
 HANDLE_EXCEPTIONS(BOARD::TracksInNetBetweenPoints)
 
 
+%include layers_id_colors_and_visibility.i
 %include board_item.i
 %include board_item_container.i
 %include board_connected_item.i
@@ -62,44 +63,6 @@ HANDLE_EXCEPTIONS(BOARD::TracksInNetBetweenPoints)
 %include netclass.i
 %include pcb_plot_params.i
 
-%ignore operator++(SCH_LAYER_ID&);
-
-%ignore operator++(GAL_LAYER_ID&);
-
-%ignore operator+(const GAL_LAYER_ID&, int);
-
-%include layers_id_colors_and_visibility.h
-
-// Extend LSET by 2 methods to add or remove layers from the layer list
-// Mainly used to add or remove layers of a pad layer list
-%extend LSET
-{
-    LSET addLayer( PCB_LAYER_ID aLayer)    { return self->set(aLayer); }
-    LSET removeLayer( PCB_LAYER_ID aLayer) { return self->reset(aLayer); }
-    LSET addLayerSet( LSET aLayerSet)    { return *self |= aLayerSet; }
-    LSET removeLayerSet( LSET aLayerSet) { return *self &= ~aLayerSet; }
-
-    %pythoncode
-    %{
-    def AddLayer(self, layer):
-        return self.addLayer( layer )
-
-    def AddLayerSet(self, layers):
-        return self.addLayerSet( layers )
-
-    def RemoveLayer(self, layer):
-        return self.removeLayer( layer )
-
-    def RemoveLayerSet(self, layers):
-        return self.removeLayerSet( layers )
-    %}
-}
-%{
-#include <layers_id_colors_and_visibility.h>
-#include <pcbnew_scripting_helpers.h>
-%}
-
-
 // std::vector templates
 %template(VIA_DIMENSION_Vector) std::vector<VIA_DIMENSION>;
 

pcbnew/swig/layers_id_colors_and_visibility.i

@@ -0,0 +1,65 @@
+
+%ignore operator++(SCH_LAYER_ID&);
+
+%ignore operator++(GAL_LAYER_ID&);
+
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 1992-2020 KiCad Developers, see AUTHORS.txt for contributors.
+ *
+ * This program 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 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+/**
+ * @file layers_id_colors_and_visibility.i
+ * @brief layers IDs, draw layers IDs, layers set and templates
+ * these IDs are used as physical layers or draw layers (for colors, visibility...)
+ */
+%ignore operator+(const GAL_LAYER_ID&, int);
+
+%include layers_id_colors_and_visibility.h
+
+// Extend LSET by 2 methods to add or remove layers from the layer list
+// Mainly used to add or remove layers of a pad layer list
+%extend LSET
+{
+    LSET addLayer( PCB_LAYER_ID aLayer)    { return self->set(aLayer); }
+    LSET removeLayer( PCB_LAYER_ID aLayer) { return self->reset(aLayer); }
+    LSET addLayerSet( LSET aLayerSet)    { return *self |= aLayerSet; }
+    LSET removeLayerSet( LSET aLayerSet) { return *self &= ~aLayerSet; }
+
+    %pythoncode
+    %{
+    def AddLayer(self, layer):
+        return self.addLayer( layer )
+
+    def AddLayerSet(self, layers):
+        return self.addLayerSet( layers )
+
+    def RemoveLayer(self, layer):
+        return self.removeLayer( layer )
+
+    def RemoveLayerSet(self, layers):
+        return self.removeLayerSet( layers )
+    %}
+}
+%{
+#include <layers_id_colors_and_visibility.h>
+#include <pcbnew_scripting_helpers.h>
+%}