Add 7T T2*w and qT1 in-vivo template + atlas

[Nilser3]

Hi @jcohenadad

It is a template and atlas developed by the CRMBM team, Marseille,
I would like to see the best way for a possibility to implement it in PAM50.

Presented at the ISMRM23 : AMU7T: a 3D qT1 and T2*w high-resolution in vivo template with refined white and gray matter parcellation dedicated to 7T spinal cord MR analyses

Initial remarks:

Alignment with PAM50 template

r = ( 0.175781 x 0.175781 x 0.5 )mm
dim1 110
dim2 90
dim3 224

Atlas labels + Lookup tables for atlas visualization in FSLeyes:

[jcohenadad]

@Nilser3 this is great. Happy to provide support, however I would like the SCT core dev team at large to be involved in the support/decisions (ie: the issue is directed at me, but it should be directed to the team).

Few comments:

• please provide a link to the full ISMRM citation
• the "Alignment with PAM50 template" would be best assessed by showing the underlying T2* contrast of the PAM50
• Please indicate where we can find the image files and associated TXT file that contains the atlas labels
• I suggest opening a branch and PR to discuss this integration