Update imports

Author: Onur Rauf Bingol

geomdl/_exchange.py

@@ -7,7 +7,7 @@
 
 """
 
-from geomdl import NURBS, compatibility
+from . import NURBS, compatibility
 
 
 def import_smesh_single(file_name):

geomdl/exchange.py

@@ -10,13 +10,7 @@
 import os
 import struct
 import json
-from . import abstract
-from . import NURBS
-from . import multi
-from . import compatibility
-from . import operations
-from . import utilities
-from . import convert
+from . import abstract, NURBS, multi, compatibility, operations, utilities, convert
 from ._exchange import import_smesh_single, import_dict_crv, export_dict_crv, import_dict_surf, export_dict_surf