- 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/__init__.py

@@ -2,17 +2,17 @@ import pkgutil
 import sys
 
 # allowed command tests (please append them alphabetically ordered)
-from test_TclCommandAddPolygon import *
-from test_TclCommandAddPolyline import *
-from test_TclCommandCncjob import *
-from test_TclCommandDrillcncjob import *
-from test_TclCommandExportGcode import *
-from test_TclCommandExteriors import *
-from test_TclCommandImportSvg import *
-from test_TclCommandInteriors import *
-from test_TclCommandIsolate import *
-from test_TclCommandNew import *
-from test_TclCommandNewGeometry  import *
-from test_TclCommandOpenExcellon import *
-from test_TclCommandOpenGerber import *
-from test_TclCommandPaintPolygon import *
+from .test_TclCommandAddPolygon import *
+from .test_TclCommandAddPolyline import *
+from .test_TclCommandCncjob import *
+from .test_TclCommandDrillcncjob import *
+from .test_TclCommandExportGcode import *
+from .test_TclCommandExteriors import *
+from .test_TclCommandImportSvg import *
+from .test_TclCommandInteriors import *
+from .test_TclCommandIsolate import *
+from .test_TclCommandNew import *
+from .test_TclCommandNewGeometry  import *
+from .test_TclCommandOpenExcellon import *
+from .test_TclCommandOpenGerber import *
+from .test_TclCommandPaintPolygon import *

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):
     """

tests/test_tclCommands/test_TclCommandDrillcncjob.py

@@ -1,5 +1,5 @@
 from FlatCAMObj import FlatCAMObj
-from test_TclCommandOpenExcellon import *
+from .test_TclCommandOpenExcellon import *
 
 
 def test_drillcncjob(self):

tests/test_tclCommands/test_TclCommandExportGcode.py

@@ -1,8 +1,8 @@
 import os
 import tempfile
 
-from test_TclCommandCncjob import *
-from test_TclCommandDrillcncjob import *
+from .test_TclCommandCncjob import *
+from .test_TclCommandDrillcncjob import *
 
 
 def test_export_gcodecncjob(self):