enh: allow additional dcm2niix configuration

[mgxd]

Fixes #206

• allow passing of an interface config through the use of Nipype's BaseInterface.__init__(from_file)

[codecov-io]

Codecov Report

Merging #208 into master will decrease coverage by <.01%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master     #208      +/-   ##
==========================================
- Coverage   68.29%   68.28%   -0.01%     
==========================================
  Files          30       30              
  Lines        2359     2362       +3     
==========================================
+ Hits         1611     1613       +2     
- Misses        748      749       +1

Impacted Files	Coverage Δ
heudiconv/cli/run.py	75% <100%> (+0.16%)	⬆️
heudiconv/convert.py	76.88% <80%> (-0.25%)	⬇️

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[mgxd]

no objections?

[yarikoptic]

what is the usecase you are trying to fulfill? i.e. what custom option needs to be passed which should not be a part of the heuristic (as --bids should become)?

[yarikoptic]

hm, one use case just came up: rordenlab/dcm2niix#198

[yarikoptic]

in the light of #273 -- when was from_file treatment introduced? seems to be not in 0.12

[satra]

from_file is s generic keyword for all interfaces to load configuration settings from a json file.