unrecognized function or variable: write_4d_nifti

[jaheis]

Magia run halts when running with 'suv' model and is using magia_suv_image function

[buccimtpc]

Please report, which image_id generated the error, in case we want to troubleshoot/debug

[jaheis]

Tested with: 'a1091' and 'a1096'

[buccimtpc]

I fixed frames of a1091 and visualize_suvs (already committed) and run_magia now proceeds till the smoothing. Now that has to be fixed (Issue #100 )