add AFNI interface 3dUndump

[salma1601]

added in afni.utils

[codecov-io]

Codecov Report

Merging #2186 into master will increase coverage by 0.01%.
The diff coverage is 93.54%.

@@            Coverage Diff             @@
##           master    #2186      +/-   ##
==========================================
+ Coverage   72.28%   72.29%   +0.01%     
==========================================
  Files        1171     1172       +1     
  Lines       58622    58653      +31     
  Branches     8433     8437       +4     
==========================================
+ Hits        42377    42406      +29     
- Misses      14887    14888       +1     
- Partials     1358     1359       +1

Flag	Coverage Δ
#smoketests	72.29% <93.54%> (+0.01%)	⬆️
#unittests	69.96% <93.54%> (+0.01%)	⬆️

Impacted Files	Coverage Δ
nipype/interfaces/afni/__init__.py	100% <ø> (ø)	⬆️
nipype/interfaces/afni/utils.py	83.85% <100%> (+0.49%)	⬆️
nipype/interfaces/afni/tests/test_auto_Undump.py	85.71% <85.71%> (ø)

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