stack_greedy: Paul's histology stack to MRI registration implementation
Usage:
  stack_greedy voladd [cmd_options] <project_dir>
Required Command Options:
  -i <image>             : 3D image to use as target of registration. Must have the
                           same dimensions as the volume used in volmatch and must
                           be registred to the volume used in volmatch.
  -n <string>            : Name by which to refer to the new volume.
