- converted from Python2 code to Python3 code

- in camlib.py, CNCJob class -> generate_from_excellon_by_tool() was
failing in the line to sort the tools due of been unable to compare
between dict's. I replaced that section.

tests/test_tclCommands/test_TclCommandCncjob.py

@@ -1,5 +1,5 @@
 from FlatCAMObj import FlatCAMGerber, FlatCAMGeometry, FlatCAMObj
-from test_TclCommandIsolate import *
+from .test_TclCommandIsolate import *
 
 def test_cncjob(self):
     """