Use collection and instance terminology in Python API

This follows naming convention agreed on in T56648.

release/scripts/templates_py/operator_modal_view3d_raycast.py

@@ -23,7 +23,7 @@ def main(context, event):
             if obj.type == 'MESH':
                 yield (obj, obj.matrix_world.copy())
 
-            if obj.dupli_type != 'NONE':
+            if obj.instance_type != 'NONE':
                 obj.dupli_list_create(scene)
                 for dob in obj.dupli_list:
                     obj_dupli = dob.object