amp2response: Speedup
amp2response: Speedup

Pre-allocate memory for ZSH transformations and image data, rather than using Eigen's conservativeResize() function.
Closes #1231.

MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3