- 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.

tclCommands/TclCommandSetSys.py

@@ -1,8 +1,8 @@
 from ObjectCollection import *
-import TclCommand
+from tclCommands.TclCommand import TclCommand
 
 
-class TclCommandSetSys(TclCommand.TclCommand):
+class TclCommandSetSys(TclCommand):
     """
     Tcl shell command to set the value of a system variable