Split sunbeam.cpp

Split file in order to enhance c++ source file structure

sunbeam/group.cpp

@@ -0,0 +1,23 @@
+#include <opm/parser/eclipse/EclipseState/Schedule/Group.hpp>
+
+#include "group.hpp"
+
+namespace py = boost::python;
+using namespace Opm;
+
+
+namespace group {
+
+    py::list wellnames( const Group& g, size_t timestep ) {
+        return iterable_to_pylist( g.getWells( timestep )  );
+    }
+
+    void export_Group() {
+
+        py::class_< Group >( "Group", py::no_init )
+            .add_property( "name", mkcopy( &Group::name ) )
+            .def( "_wellnames", &wellnames )
+            ;
+
+    }
+}