- 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_pathconnect.py

@@ -20,7 +20,7 @@ def mkstorage(paths):
 class PathConnectTest1(unittest.TestCase):
 
     def setUp(self):
-        print "PathConnectTest1.setUp()"
+        print("PathConnectTest1.setUp()")
         pass
 
     def test_simple_connect(self):
@@ -68,8 +68,8 @@ class PathConnectTest1(unittest.TestCase):
                                                          [2 + offset_x, 1 + offset_y]])))
 
     def test_ring_interfere_connect(self):
-        print
-        print "TEST STARTING ..."
+        print()
+        print("TEST STARTING ...")
 
         paths = [
             LineString([[0, 0], [1, 1]]),