MAINT: Finalize upstreaming of ants interfaces to nipype

[oesteban]

After nipy/nipype#3210 the niworkflows/interfaces/ants.py can go in whole.

@mgxd we need to cut an RC (talking about fMRIPrep) and exercise this particular change in a good range of datasets to make sure all use-cases are covered. Happy to talk about more targetted tests. This integration could be disastrous in the long term.

[pull-assistant]

Best reviewed: commit by commit

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Optimal code review plan (1 warning)

MAINT: Finalize upstreaming of ants interfaces to nipype

niworkflows/interfaces/ants.py 71% changes removed in fix: revise some imp...

     fix: revise some imports from nipype, rework ImageMaths temporary patc...

     chore: pin nipype-1.5.0rc1, which includes the new interfaces

     enh: replace ANTs' ResampleImageBySpacing with RegridToZooms

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[codecov]

Codecov Report

Merging #506 into master will decrease coverage by 4.61%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #506      +/-   ##
==========================================
- Coverage   64.65%   60.03%   -4.62%     
==========================================
  Files          44       43       -1     
  Lines        5375     5170     -205     
  Branches      786      749      -37     
==========================================
- Hits         3475     3104     -371     
- Misses       1742     1931     +189     
+ Partials      158      135      -23     

Flag	Coverage Δ
#documentation	?
#masks	?
#reportlettests	?
#travis	60.03% <66.66%> (+0.20%)	⬆️
#unittests	?

Impacted Files	Coverage Δ
niworkflows/utils/images.py	80.00% <40.00%> (-2.76%)	⬇️
niworkflows/anat/ants.py	13.01% <54.54%> (-57.77%)	⬇️
niworkflows/func/util.py	22.35% <100.00%> (-57.65%)	⬇️
niworkflows/interfaces/ants.py	100.00% <100.00%> (+34.37%)	⬆️
niworkflows/interfaces/images.py	66.14% <100.00%> (+0.25%)	⬆️
niworkflows/anat/freesurfer.py	39.13% <0.00%> (-52.18%)	⬇️
niworkflows/anat/skullstrip.py	30.00% <0.00%> (-50.00%)	⬇️
niworkflows/interfaces/itk.py	26.92% <0.00%> (-12.31%)	⬇️
... and 8 more

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[oesteban]

With this perspective, this PR can be postponed until after the RC.