[WIP][FIX] Bug ApplyInverseTransform

[davidmeunier79]

corrected field -> out{1}.pull for in_files and interpolation

[effigies]

I'm concerned that this works with the newest version, but will break older scripts. I'm not familiar enough with SPM to say.

[codecov]

Codecov Report

Merging #3326 (527699c) into master (ea117f2) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #3326      +/-   ##
==========================================
- Coverage   65.04%   65.01%   -0.04%     
==========================================
  Files         302      302              
  Lines       40035    40035              
  Branches     5291     5291              
==========================================
- Hits        26042    26029      -13     
- Misses      12927    12935       +8     
- Partials     1066     1071       +5     

Flag	Coverage Δ
unittests	64.71% <0.00%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
nipype/interfaces/spm/utils.py	60.59% <0.00%> (ø)
nipype/pipeline/plugins/legacymultiproc.py	65.68% <0.00%> (-3.44%)	⬇️
nipype/pipeline/plugins/base.py	58.08% <0.00%> (-1.65%)	⬇️

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