d4701cb4 Add note for int8 to vtkSignedCharArray conversion
78608d54 Remove numpy.character comments from numpy test
5267f004 Convert np.int8 to VTK_SIGNED_CHAR
2cab0baf Decouple numpy_support from pickle_support

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Reviewed-by: Ben Boeckel <ben.boeckel@kitware.com>
Reviewed-by: Charles Gueunet <charles.gueunet@kitware.com>
Merge-request: !10623