Add hidden DOF (and --fsl-dof) options to BBRegister

[effigies]

No description provided.

[codecov-io]

Codecov Report

Merging #1917 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1917      +/-   ##
==========================================
+ Coverage   72.55%   72.55%   +<.01%     
==========================================
  Files        1064     1064              
  Lines       54170    54172       +2     
  Branches     7810     7810              
==========================================
+ Hits        39303    39305       +2     
  Misses      13649    13649              
  Partials     1218     1218

Flag	Coverage Δ
#smoketests	72.55% <100%> (ø)	⬆️
#unittests	70.02% <100%> (ø)	⬆️

Impacted Files	Coverage Δ
...ype/interfaces/freesurfer/tests/test_BBRegister.py	77.77% <ø> (ø)	⬆️
nipype/interfaces/freesurfer/preprocess.py	66.77% <100%> (+0.07%)	⬆️

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