ENH:  Adding B-spline SyN deformable registration for intensity based point set metrics.
ENH:  Adding B-spline SyN deformable registration for intensity based point set metrics.

dawnsong/ANTs,DaisukeMiyamoto/ANTs,fliem/ANTs,dawnsong/ANTs,DaisukeMiyamoto/ANTs,fliem/ANTs,DaisukeMiyamoto/ANTs,fliem/ANTs,fbudin69500/ANTs,stnava/ANTs,dawnsong/ANTs,fliem/ANTs,DaisukeMiyamoto/ANTs,fliem/ANTs,dawnsong/ANTs,fbudin69500/ANTs,dawnsong/ANTs,stnava/ANTs,fliem/ANTs,stnava/ANTs,DaisukeMiyamoto/ANTs,dawnsong/ANTs,stnava/ANTs,fliem/ANTs,fbudin69500/ANTs,fbudin69500/ANTs,fbudin69500/ANTs,DaisukeMiyamoto/ANTs,stnava/ANTs,dawnsong/ANTs,DaisukeMiyamoto/ANTs,fbudin69500/ANTs,stnava/ANTs,fbudin69500/ANTs,stnava/ANTs