1.6.1 (June 16, 2021)

Bug-fix release in the 1.6.x series.

(`Full changelog <https://github.com/nipy/nipype/milestone/1.6.1?closed=1>`__)

* FIX: Set DistributedPluginBase.refidx type correctly (https://github.com/nipy/nipype/pull/3340)

* FIX: change fsl interface randomise --f_only to --fonly for #3322 (https://github.com/nipy/nipype/pull/3325)

* FIX: BET raising "No image files match: ..." with very long file names (https://github.com/nipy/nipype/pull/3309)

* FIX: Update SmoothEstimateOutputSpec resels description (https://github.com/nipy/nipype/pull/3316)

* ENH: Adds interfaces for MRtrix utils shconv and sh2amp (https://github.com/nipy/nipype/pull/3280)

* ENH: Interface for R (https://github.com/nipy/nipype/pull/3291)

* ENH: Add CAT12 interfaces (https://github.com/nipy/nipype/pull/3310)

* ENH: AFNI 3dNetCorr as afni.NetCorr (https://github.com/nipy/nipype/pull/3263)

* ENH: Skip newline before Python call in batch submission to facilitate containerized runs (https://github.com/nipy/nipype/pull/3297)

* ENH: Add new dwifslpreproc interface for MRtrix3 (https://github.com/nipy/nipype/pull/3278)

* REF: Cache nodes in workflow to speed up construction, other optimizations (https://github.com/nipy/nipype/pull/3331)

* DOC: Fixed Developer Setup Link in install.rst (https://github.com/nipy/nipype/pull/3330)

* MNT: Blacklist Dipy 1.4.1 (https://github.com/nipy/nipype/pull/3335)

* MNT: Drop support for numpy < 1.15.3 (https://github.com/nipy/nipype/pull/3284)

* CI: Build docker images with Python 3.8 (https://github.com/nipy/nipype/pull/3287)

* CI: Drop Circle doc builds (https://github.com/nipy/nipype/pull/3338)

* CI: Drop Travis (https://github.com/nipy/nipype/pull/3332)

* CI: Build docker images with Python 3.8 (https://github.com/nipy/nipype/pull/3287)

* CI: Add specs and style checks (https://github.com/nipy/nipype/pull/3321)

* CI: Move from Travis to GitHub actions (https://github.com/nipy/nipype/pull/3318)