ENH: Added support for Bru2's -z compress option

[TheChymera]

Acknowledgment

• (Mandatory) I acknowledge that this contribution will be available under the Apache 2 license.

[effigies]

Looks good. (Circle tests are failing for unrelated reasons.) Want to run make specs to update the auto test?

[codecov-io]

Codecov Report

Merging #2762 into master will decrease coverage by 3.39%.
The diff coverage is 25%.

@@            Coverage Diff            @@
##           master    #2762     +/-   ##
=========================================
- Coverage   67.44%   64.04%   -3.4%     
=========================================
  Files         340      338      -2     
  Lines       43170    43122     -48     
  Branches     5352     5350      -2     
=========================================
- Hits        29116    27618   -1498     
- Misses      13356    14438   +1082     
- Partials      698     1066    +368

Flag	Coverage Δ
#smoketests	?
#unittests	64.04% <25%> (-0.77%)	⬇️

Impacted Files	Coverage Δ
nipype/interfaces/bru2nii.py	70% <25%> (-4.08%)	⬇️
nipype/interfaces/nilearn.py	40% <0%> (-56.67%)	⬇️
nipype/utils/spm_docs.py	25.92% <0%> (-44.45%)	⬇️
nipype/interfaces/freesurfer/base.py	49.59% <0%> (-30.9%)	⬇️
nipype/utils/logger.py	59.7% <0%> (-29.86%)	⬇️
nipype/algorithms/rapidart.py	35.39% <0%> (-29.21%)	⬇️
nipype/interfaces/spm/base.py	58.41% <0%> (-29.05%)	⬇️
nipype/utils/provenance.py	55.73% <0%> (-28.99%)	⬇️
nipype/interfaces/fsl/model.py	55.26% <0%> (-25.35%)	⬇️
nipype/testing/fixtures.py	77.33% <0%> (-21.34%)	⬇️
... and 43 more

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[effigies]

Thanks!