2035 niftyreg regaverage

[byvernault]

Fixes issue #2035 .

Changes proposed in this pull request:

• adding _list_outputs to reg_average interface because it was removed from the NiftyRegCommand interface in base.py to fix the output not linked properly.

Kind Regards,
Ben

[codecov-io]

Codecov Report

Merging #2037 into master will decrease coverage by 0.01%.
The diff coverage is 16.66%.

@@            Coverage Diff             @@
##           master    #2037      +/-   ##
==========================================
- Coverage   72.19%   72.18%   -0.02%     
==========================================
  Files        1132     1132              
  Lines       57032    57038       +6     
  Branches     8167     8168       +1     
==========================================
- Hits        41175    41172       -3     
- Misses      14572    14580       +8     
- Partials     1285     1286       +1

Flag	Coverage Δ
#smoketests	72.18% <16.66%> (-0.02%)	⬇️
#unittests	69.77% <16.66%> (-0.02%)	⬇️

Impacted Files	Coverage Δ
nipype/interfaces/niftyreg/regutils.py	82.03% <16.66%> (-1.97%)	⬇️
nipype/interfaces/base.py	83.41% <0%> (-0.37%)	⬇️

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