ENH: add name template and assign output filename for autobox

[ariekahn]

See #1766

[codecov-io]

Codecov Report

Merging #1767 into master will increase coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1767      +/-   ##
==========================================
+ Coverage   72.71%   72.71%   +<.01%     
==========================================
  Files        1059     1059              
  Lines       52550    52545       -5     
==========================================
- Hits        38212    38210       -2     
+ Misses      14338    14335       -3

Flag	Coverage Δ
#unittests	72.71% <ø> (ø)	✅

Impacted Files	Coverage Δ
nipype/interfaces/afni/utils.py	78.7% <ø> (+0.89%)	✅
nipype/interfaces/afni/base.py	65.59% <ø> (-1.08%)	❌

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[mgxd]

LGTM, cc @satra