STYLE: Prefer initialization to assignement.

When instantiating a class, initialization should be preferred over assignment.

Change-Id: Ie603d5a98554909d7d8a8adeb3fc3aaf6e45c9e5
COMP: extend test for HistogramMatchingImageFilter to more pixel types

Change-Id: I4a280827fddd0ef8ef3e13c9da82a53127d49e5e
Merge topic 'PreferInitializationToAssignement'

26626e8 STYLE: Prefer initialization to assignement.
Merge topic 'ExpandHistogramMatchingTest-3059'

af65bb0 COMP: extend test for HistogramMatchingImageFilter to more pixel types