fix: renamed mask_file to mask_files

[mgxd]

removes support for CompCor input mask_file - closes #1982

[chrisgorgo]

One more: https://github.com/mgxd/nipype/blob/8949299e03191ecb23a494eb1bbfda3026d13456/nipype/algorithms/confounds.py#L604

[satra]

hold off on merging, i'm cleaning up the code.

[codecov-io]

Codecov Report

Merging #1984 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1984      +/-   ##
==========================================
- Coverage   72.29%   72.29%   -0.01%     
==========================================
  Files        1089     1089              
  Lines       55583    55582       -1     
  Branches     8009     8009              
==========================================
- Hits        40182    40181       -1     
- Misses      14137    14147      +10     
+ Partials     1264     1254      -10

Flag	Coverage Δ
#smoketests	72.29% <0%> (-0.01%)	⬇️
#unittests	69.81% <0%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
nipype/algorithms/confounds.py	74.59% <0%> (-0.06%)	⬇️
nipype/workflows/fmri/fsl/preprocess.py	87.96% <0%> (ø)	⬆️
nipype/sphinxext/plot_workflow.py	13.29% <0%> (ø)	⬆️
nipype/interfaces/spm/model.py	71.74% <0%> (ø)	⬆️
nipype/interfaces/spm/preprocess.py	68.93% <0%> (ø)	⬆️
nipype/workflows/dmri/fsl/artifacts.py	81.28% <0%> (ø)	⬆️
nipype/interfaces/fsl/base.py	84.04% <0%> (ø)	⬆️
nipype/testing/decorators.py	66.66% <0%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d82a18f...2f76fbb. Read the comment docs.

[satra]

closing this for #1992