Fix two failing tests on Windows:

1- ex30_tepal.py -  vetoe this test on Windows since 3D Mesher is not available GHS3DRPL -  MeshGemsh
  2- creating_parallel_mesh.py: on windows we build Python without tcl/tk thus tkinter module is missing -  do not raise exception in that case
Tested OK on Windows

doc/examples/creating_parallel_mesh.py

@@ -1,7 +1,11 @@
 # contains function to compute a mesh in parallel
 from platform import java_ver
 import sys
-from tkinter import W
+try:
+    from tkinter import W
+except:
+    print("warning: could not import tkinter")
+
 import salome
 
 import time

test/tests.set

@@ -33,7 +33,6 @@ SET(BAD_TESTS
   ex04_cube5tetraHexa.py
   ex21_lamp.py
   ex29_refine.py
-  ex30_tepal.py
   ex_MakePolyLine.py
   test_smeshplugins.py
   PAL_MESH_041_mesh.py
@@ -68,6 +67,7 @@ SET(BAD_TESTS
   )
 IF(NOT WIN32)
   LIST(APPEND BAD_TESTS
+    ex30_tepal.py
     test_smeshplugin_mg_tetra_parallele.py
   )
 ENDIF(NOT WIN32)