Parallelize parcellation and replace atlases

[tsalo]

Closes #247.

Changes proposed in this pull request

• Replace atlases with ones from XCP-D. We'll need to replace these with the AtlasPack ones once those are finalized and released.
• Dramatically simplify the output workflow. Only use one for both GE and non-GE data.
• Fix bug with generating standard-space derivatives. The problem was that density was not defined as an entity in the config file, so it was being interpreted as a metadata field with a value of _undefined.
• Use MapNodes for managing parcellation and writing parcellated derivatives.
• Apply series of transforms from MNI152NLin6Asym to ASL reference space to atlases.
• Replace uses of ANTS's ApplyTransforms with a modified version of FixHeaderApplyTransforms.
• Rename init_cbfroiquant_wf to init_parcellate_cbf_wf.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.17 ⚠️

Comparison is base (2151899) 50.94% compared to head (b85cae0) 50.78%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #254      +/-   ##
==========================================
- Coverage   50.94%   50.78%   -0.17%     
==========================================
  Files         132      135       +3     
  Lines       12595    12595              
==========================================
- Hits         6417     6396      -21     
- Misses       6178     6199      +21     

Impacted Files	Coverage Δ
aslprep/interfaces/ants.py	100.00% <ø> (ø)
aslprep/interfaces/cbf_computation.py	82.53% <ø> (-1.03%)	⬇️
aslprep/interfaces/parcellation.py	97.43% <ø> (ø)
aslprep/tests/test_cli.py	100.00% <ø> (ø)
aslprep/utils/atlas.py	7.89% <ø> (ø)
aslprep/utils/misc.py	64.21% <ø> (-3.06%)	⬇️
aslprep/workflows/asl/base.py	81.53% <ø> (ø)
aslprep/workflows/asl/cbf.py	80.55% <ø> (-2.88%)	⬇️
aslprep/workflows/asl/confounds.py	100.00% <ø> (ø)
aslprep/workflows/asl/ge_utils.py	83.33% <ø> (-0.15%)	⬇️
... and 6 more

... and 1 file with indirect coverage changes

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