Adopt BIDS Atlas organization

[tsalo]

Summary

Given that the Atlas BEP is almost ready to merge into BIDS, we should prepare to bring our atlases in line with it.

This is just an initial draft. It may change depending on if any changes are made to the BEP before it is added to the standard.

sourcedata/
    atlas-<label>/
        dataset_description.json
        atlas-<label>_description.json
        tpl-<label>/
            anat/
                tpl-<label>_atlas-<label>[_seg-<label>][_scale-<label>][_res-<label>]_dseg.nii.gz
                tpl-<label>_atlas-<label>[_seg-<label>][_scale-<label>][_res-<label>]_dseg.json
                tpl-<label>_atlas-<label>[_seg-<label>][_scale-<label>][_res-<label>]_dseg.tsv
sub-<label>/
    func/
        <source_entities>_space-<label>_atlas-<label>[_seg-<label>][_scale-<label>]_stat-coverage_bold.tsv
        <source_entities>_space-<label>_atlas-<label>[_seg-<label>][_scale-<label>]_stat-mean_timeseries.tsv
        <source_entities>_space-<label>_atlas-<label>[_seg-<label>][_scale-<label>]_stat-pearsoncorrelation_relmat.tsv

Additional details

This is related to PennLINC/xcp_d#1540.

Next steps