ENH: tcksift2

[shachafy]

List of changes proposed in this PR (pull-request)

An interface for MRTrix's tcksift2 as part of the overall effort to include as many as possible of the tools being used in the neuroimaging society.

Fixes #3666

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 3 lines in your changes missing coverage. Please review.

Project coverage is 70.51%. Comparing base (6ac81ca) to head (a49f154).
Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
nipype/interfaces/mrtrix3/utils.py	78.57%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3668      +/-   ##
==========================================
- Coverage   70.87%   70.51%   -0.37%     
==========================================
  Files        1276     1277       +1     
  Lines       59238    59263      +25     
  Branches     9812     9814       +2     
==========================================
- Hits        41984    41788     -196     
- Misses      16079    16336     +257     
+ Partials     1175     1139      -36     

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[effigies]

For this to work, this needs to be added to

nipype/nipype/interfaces/mrtrix3/__init__.py

Lines 17 to 36 in a49f154

	from .utils import (
	TCK2VTK,
	BrainMask,
	ComputeTDI,
	DWIExtract,
	Generate5tt,
	Mesh2PVE,
	MRCat,
	MRConvert,
	MRMath,
	MRResize,
	MRTransform,
	SH2Amp,
	SHConv,
	TensorMetrics,
	TransformFSLConvert,
	MaskFilter,
	MTNormalise,
	Generate5tt2gmwmi,
	)

[effigies]

Doctest needs to either import from fully-qualified module or the interface needs to be imported into the parent __init__.py.