coronavirus * n4 bug fixes * Unsharp mask filter added to ImageMath * Bug fixes for ImageMath morphological operators * Command line arg bug fixes and improvements for N3BiasFieldCorrection, antsRegistration, antsApplyTransforms, antsMotionCorr * Option to install libraries only for more compact ANTsR builds * Multiple code updates for C++11 * DOC: none sampling strategy * ITKv5 compatibility * cmake improvements for containers, distribution, etc