TEST: Install FSL without NeuroDebian

[effigies]

Builds off of #2707 to see if a non-NeuroDebian FSL tests clean.

[codecov-io]

Codecov Report

Merging #2763 into master will decrease coverage by 3.45%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #2763      +/-   ##
=========================================
- Coverage   67.46%     64%   -3.46%     
=========================================
  Files         340     338       -2     
  Lines       43173   43122      -51     
  Branches     5353    5350       -3     
=========================================
- Hits        29125   27602    -1523     
- Misses      13350   14449    +1099     
- Partials      698    1071     +373

Flag	Coverage Δ
#smoketests	?
#unittests	64% <ø> (-0.84%)	⬇️

Impacted Files	Coverage Δ
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%)	⬇️
nipype/interfaces/matlab.py	64.64% <0%> (-21.22%)	⬇️
... and 42 more

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