[ENH] Added outputs' generation to DWIBiascorrect interface

[GalKepler]

Fixed #3475

[codecov]

Codecov Report

Merging #3476 (4c5d106) into master (b410d08) will decrease coverage by 0.00%.
The diff coverage is 16.66%.

@@            Coverage Diff             @@
##           master    #3476      +/-   ##
==========================================
- Coverage   65.25%   65.24%   -0.01%     
==========================================
  Files         309      309              
  Lines       40838    40844       +6     
  Branches     5376     5377       +1     
==========================================
+ Hits        26647    26648       +1     
- Misses      13117    13122       +5     
  Partials     1074     1074              

Flag	Coverage Δ
unittests	65.02% <16.66%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
nipype/interfaces/mrtrix3/preprocess.py	80.00% <16.66%> (-2.84%)	⬇️

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