- 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.

flatcam

@@ -30,6 +30,6 @@ debug_trace()
 # NOTE: Never talk to the GUI from threads! This is why I commented the above.
 
 app = QtGui.QApplication(sys.argv)
-QtCore.QDir.setSearchPaths("share", QtCore.QStringList(("share", "share/flatcam", "/usr/share/flatcam")));
+QtCore.QDir.setSearchPaths("share", str(("share", "share/flatcam", "/usr/share/flatcam")));
 fc = App()
 sys.exit(app.exec_())