COMP: Fix -Woverloaded-virtual in itkSpatialObjectToSpatialObjectFilter.

Follow the lead in itkImageToImageFilter.h for the SetInput method warnings.

Change-Id: I3c01e51f0a02a3b840b98be0b3ec1429d5f3a362
COMP: Fix incorrect ThreadedApplyUpdate signature.

In DiffusiveRegistrationFilter, the virtual method did not have
the correct signature, as alerted by the compiler warning.

Change-Id: Iedc759aca711fbf1cc24b878ed61b8203e072d26
Merge topic 'Warnings'

7a8d58c COMP: Fix incorrect ThreadedApplyUpdate signature.
64e98ac COMP: Fix -Woverloaded-virtual in itkSpatialObjectToSpatialObjectFilter.