ENH: manual syncing with the performance branch

using beyond compare
The commits from the performance branch were too intertwined with code not ready for releasing via the trunk. Therefore we could not use the merge functionality.

Most important changes are:
- moved the displacement distribution code to the Common directory
- Added multi-threading to the displacement distribution code
- Added an option to compute the exact metric value every few iterations (nice for evaluation purposes)

Author: mstaring

src/Common/CMakeLists.txt

@@ -25,6 +25,10 @@ set( CommonFiles
   itkAdvancedLinearInterpolateImageFunction.hxx
   itkAdvancedRayCastInterpolateImageFunction.h
   itkAdvancedRayCastInterpolateImageFunction.hxx
+  itkComputeDisplacementDistribution.h
+  itkComputeDisplacementDistribution.hxx
+  itkComputeJacobianTerms.h
+  itkComputeJacobianTerms.hxx
   itkGenericMultiResolutionPyramidImageFilter.h
   itkGenericMultiResolutionPyramidImageFilter.hxx
   itkImageFileCastWriter.h

src/Common/Transforms/itkGridScheduleComputer.hxx

@@ -146,8 +146,7 @@ GridScheduleComputer< TTransformScalarType, VImageDimension >
     for( unsigned int dim = 0; dim < Dimension; ++dim )
     {
       /** Compute the grid spacings. */
-      double gridSpacing
-                                         = finalGridSpacing[ dim ] * this->m_GridSpacingFactors[ res ][ dim ];
+      double gridSpacing                 = finalGridSpacing[ dim ] * this->m_GridSpacingFactors[ res ][ dim ];
       this->m_GridSpacings[ res ][ dim ] = gridSpacing;
 
       /** Compute the grid size without the extra grid points at the edges. */