1.2.0

Adds "out_files" output field and better handling of postfixes

With the exception of fMRI and DWI datasets, if dcm2niix processes a file with more than 3 dimensions (e.g. multiple echos, multiple antennas/coils, multiple real/imaginary/mag/phase components, etc...), it will split the image into separate images disambiguated by postfixes. This release adds better handling of these cases by

• Adding a new catchall out_files output field that collects all disambiguated images and their JSON side cars (if present) into a single list.
• echo and suffix input fields are replaced with generic file_postfix field, which selects one disambiguated files to return in the out_file field
  • out_file is set to attrs.NOTHING if file_postfix