Fmriprep

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With thanks to James Kent for contributions.

* ENH: EXPERIMENTAL: Fieldmap-less susceptibility correction with ``--use-syn-sdc`` option (544)
* FIX: Reduce interpolation artifacts in ConformSeries (564)
* FIX: Improve consistency of handling of fieldmaps (565)
* FIX: Apply T2w pial surface refinement at correct stage of FreeSurfer pipeline (568)
* ENH: Add ``--anat-only`` workflow option (560)
* FIX: Output all tissue class/probability maps (569)
* ENH: Upgrade to ANTs 2.2.0 (561)

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* ENH: Conform and minimally resample multiple T1w images (545)
* FIX: Return non-zero exit code on all errors (554)
* ENH: Improve error reporting for missing subjects (558)

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With thanks to Marcel Falkiewicz for contributions.

* FIX: Correctly display help in ``fmriprep-docker`` (533)
* FIX: Avoid invalid symlinks when running FreeSurfer (536)
* ENH: Improve dependency management for users unable to use Docker/Singularity containers (549)
* FIX: Return correct exit code when a Function node fails (554)

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With thanks to Feilong Ma for contributions.

* ENH: Option to provide a custom reference grid image (``--output-grid-reference``) for determining the field of view and resolution of output images (480)
* ENH: Improved EPI skull stripping and tissue contrast enhancements (519)
* ENH: Improve resource use estimates in FreeSurfer workflow (506)
* ENH: Moved missing values in the DVARS* and FramewiseDisplacement columns of the _confounds.tsv from last row to the first row (523)
* ENH: More robust initialization of the normalization procedure (529)

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* ENH: ``--output-space template`` targets template specified by ``--template`` flag (``MNI152NLin2009cAsym`` supported) (498)
* FIX: Fix a bug causing small numerical discrepancies in input data voxel size to lead to different FOV of the output files (513)

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* ENH: Use robust template generation for multiple T1w images (481)
* ENH: Anatomical MNI outputs respect ``--output-space`` selection (490)
* ENH: Added support for distortion correction using opposite phase encoding direction EPI images (493)
* ENH: Switched to FSL BET for skullstripping of EPI images (493)
* ENH: ``--omp-nthreads`` controls maximum per-process thread count; replaces ``--ants-nthreads`` (500)