Commits on Nov 25, 2021

1. PERF: Make AdvancedNormalizedCorrelationImageToImageMetric faster …

   Added a new member function to `AdvancedImageToImageMetric`, `FastEvaluateMovingImageValueAndDerivative`, which calls the multi-threaded overload of ITK's `itk::BSplineInterpolateImageFunction::EvaluateValueAndDerivativeAtContinuousIndex`, indirectly. (It does so via `EvaluateMovingImageValueAndDerivativeWithOptionalThreadId`, another new member function.)
   
   Made `AdvancedNormalizedCorrelationImageToImageMetric::ThreadedGetValueAndDerivative` faster, by calling this new `FastEvaluateMovingImageValueAndDerivative`.
   
   A large performance improvement was observed for GoogleTest unit test `itkElastixRegistrationMethod.EulerDiscRotation2D` (which uses the "AdvancedNormalizedCorrelation" metric), from ~1.5 second before this commit down to ~0.9 second after this commit, using Visual Studio 2019, Release configuration. (For a Debug configuration even from ~15 seconds before, down to ~4 seconds after this commit.)

   

   N-Dekker committed Nov 25, 2021
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