add xyzscale to AFNI 3drefit

[salma1601]

adding a parameter to afni.Refit

[codecov-io]

Codecov Report

Merging #2272 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #2272      +/-   ##
=========================================
- Coverage   72.51%   72.5%   -0.01%     
=========================================
  Files        1188    1188              
  Lines       59133   59134       +1     
  Branches     8505    8505              
=========================================
- Hits        42878   42877       -1     
- Misses      14869   14871       +2     
  Partials     1386    1386

Flag	Coverage Δ
#smoketests	72.5% <100%> (-0.01%)	⬇️
#unittests	70.13% <100%> (ø)	⬆️

Impacted Files	Coverage Δ
nipype/interfaces/afni/tests/test_auto_Refit.py	85.71% <ø> (ø)	⬆️
nipype/interfaces/afni/utils.py	83.06% <100%> (+0.02%)	⬆️
nipype/pipeline/plugins/multiproc.py	76.76% <0%> (-1.41%)	⬇️

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