[ENH] Add 3dSynthesize, -cbucket flag for 3dDeconvolve

[emdupre]

Changes proposed in this pull request

• Add a nipype wrapper for the AFNI command 3dSynthesize
• Add the cbucket flag to existing nipype wrapper of 3dDeconvolve for use with 3dSynthesize

[codecov-io]

Codecov Report

Merging #2210 into master will increase coverage by <.01%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##           master    #2210      +/-   ##
==========================================
+ Coverage   72.31%   72.32%   +<.01%     
==========================================
  Files        1179     1180       +1     
  Lines       58821    58849      +28     
  Branches     8465     8469       +4     
==========================================
+ Hits        42535    42561      +26     
- Misses      14910    14911       +1     
- Partials     1376     1377       +1

Flag	Coverage Δ
#smoketests	72.32% <93.33%> (ø)	⬆️
#unittests	69.88% <93.33%> (+0.01%)	⬆️

Impacted Files	Coverage Δ
...pype/interfaces/afni/tests/test_auto_Deconvolve.py	85.71% <100%> (ø)	⬆️
nipype/interfaces/afni/model.py	85.45% <100%> (+1.34%)	⬆️
nipype/interfaces/afni/__init__.py	100% <100%> (ø)	⬆️
...pype/interfaces/afni/tests/test_auto_Synthesize.py	85.71% <85.71%> (ø)

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[satra]

@emdupre - this looks good. however, we just merged some changes that is going to change the auto-test outputs. could you please merge with master, run make specs, and push again?