ENH: added check that the input of filter is not modifed
ENH: added check that the input of filter is not modifed

If a filter is run inplace then the input image may be modified or
changed. A check was added to verify that the hash of the input to a
filter does not change.

SimpleITK/Staging,SimpleITK/Staging,SimpleITK/Staging,SimpleITK/Staging,SimpleITK/Staging,SimpleITK/Staging,SimpleITK/Staging