Name change for NS receivers

Author: domfournier

simpeg_drivers/components/factories/receiver_factory.py

@@ -78,12 +78,12 @@ def concrete_object(self):
         elif self.factory_type == "magnetotellurics":
             from simpeg.electromagnetics.natural_source import receivers
 
-            return receivers.PointNaturalSource
+            return receivers.Impedance
 
         elif self.factory_type == "tipper":
             from simpeg.electromagnetics.natural_source import receivers
 
-            return receivers.Point3DTipper
+            return receivers.Tipper
 
     def assemble_arguments(
         self, locations=None, data=None, local_index=None, mesh=None, component=None