ENH: SmoothingQuadEdgeMeshFilter::SetCoefficientMethod calls Modified()

Change-Id: I5341b384ec13289c1b0f986f8066b994316b459e
ENH: Add progress report in itk::SmoothingQuadEdgeMeshFilter

Change-Id: Id86308f460e80d0cc4c710894d912e5a85f945c0
ENH:  Initializing the transform center.

Linear transforms derived from the itk::MatrixOffsetTransformBase
class default to a center of rotation at the origin.  However,
this is generally a suboptimal starting point for optimization.
Instead, we use the following heuristics (h/t to Brad Lowekamp
for pointing this out):
  1) we use the center of the previous linear transform
     (presumably optimized) to initialize the current linear
     transform.
  2) a special case would be if someone wanted to optimize a
     linear transform following optimization of a deformable
     transform.  What we do in this case is go back further
     in the queue to find the closest, previous linear transform
     and use its center.
  3) if there is no previous transforms, we leave the center of
     mass as the default.

Change-Id: Iacb0442e0db51a1d004e9028868ce36fe530341e
COMP: Address LaplacianDeformation Doxygen warnings.

Change-Id: I92f5cc29caf6037236cb7eeafb65453cac75eb89
Merge topic 'ProgressReportQESmoothing'

fbaea0c2 ENH: Add progress report in itk::SmoothingQuadEdgeMeshFilter
6360c21e ENH: SmoothingQuadEdgeMeshFilter::SetCoefficientMethod calls Modified()
Merge topic 'LaplacianDeformationWarnings'

807f86e8 COMP: Address LaplacianDeformation Doxygen warnings.
Merge topic 'InitializeTransformCenter'

c0f3cbb6 ENH:  Initializing the transform center.