Drop depencence on six module

src/Mod/Arch/importDAE.py

@@ -21,8 +21,6 @@
 #*                                                                         *
 #***************************************************************************
 
-from six.moves import xrange
-
 import FreeCAD, Mesh, os, numpy, MeshPart, Arch, Draft
 if FreeCAD.GuiUp:
     from DraftTools import translate

src/Mod/Import/gzip_utf8.py

@@ -16,10 +16,7 @@ but random access is not allowed."""
 import struct, sys, time, os
 import zlib
 import io
-
-from six.moves import xrange
-from six.moves.builtins import open as builtin_open
-
+from __builtin__ import open as builtin_open
 try:
     long
 except NameError:

src/Mod/Path/PathScripts/PathCircularHoleBaseGui.py

@@ -22,8 +22,6 @@
 # *                                                                         *
 # ***************************************************************************
 
-from six.moves import xrange
-
 import FreeCAD
 import FreeCADGui
 import PathScripts.PathLog as PathLog

src/Mod/Path/PathScripts/PathSurface.py

@@ -24,8 +24,6 @@
 
 from __future__ import print_function
 
-from six.moves import xrange
-
 import FreeCAD
 import MeshPart
 # import Part