Afni qwarp output paths

[salma1601]

try fix #2221

[oesteban]

All of this should not be here:

1. The out_file input spec can only define one of name_source or genfile (currently it defines both). Since we are trying to deprecate genfile, name_source should be preferred.

2. In theory, name_source should fix this issue.

[satra]

@oesteban - i'm leaving the afni stuff to @Shotgunosine and others to figure out. right now, because of the way afni works with various kinds of extensions, the straight up namesource can run into issues.

[codecov-io]

Codecov Report

Merging #2222 into master will increase coverage by <.01%.
The diff coverage is 9.09%.

@@            Coverage Diff             @@
##           master    #2222      +/-   ##
==========================================
+ Coverage   72.31%   72.31%   +<.01%     
==========================================
  Files        1180     1179       -1     
  Lines       58879    58833      -46     
  Branches     8474     8465       -9     
==========================================
- Hits        42579    42546      -33     
+ Misses      14921    14911      -10     
+ Partials     1379     1376       -3

Flag	Coverage Δ
#smoketests	72.31% <9.09%> (ø)	⬆️
#unittests	69.88% <9.09%> (ø)	⬆️

Impacted Files	Coverage Δ
nipype/interfaces/afni/tests/test_auto_Qwarp.py	85.71% <ø> (ø)	⬆️
nipype/interfaces/afni/preprocess.py	80.32% <9.09%> (-0.31%)	⬇️
nipype/pipeline/plugins/multiproc.py	76.76% <0%> (-1.41%)	⬇️
nipype/interfaces/afni/model.py	84.1% <0%> (-1.35%)	⬇️
...pype/interfaces/afni/tests/test_auto_Deconvolve.py	85.71% <0%> (ø)	⬆️
...terfaces/freesurfer/tests/test_auto_Tkregister2.py	85.71% <0%> (ø)	⬆️
...pype/interfaces/afni/tests/test_auto_Synthesize.py
nipype/interfaces/freesurfer/utils.py	63.54% <0%> (+0.46%)	⬆️
nipype/utils/profiler.py	41.35% <0%> (+1.23%)	⬆️

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