is more keeping in line with old behaviour than returning None

semantics for data access/modification. Custom logic (such as the
ImageWrapper) can optionally be used by providing a custom "DataManager"
instance on image creation.

Use dill to store function on disc

See merge request fsl/fslpy!328

Dill is a lot more robust than my previous attempt to retreive
functions stored on disc by func_to_cmd.

DOC: Changelog

See merge request fsl/fslpy!325

--imain in topup can take multiple filenames

See merge request fsl/fslpy!324

DOC: changelog

See merge request fsl/fslpy!322

BUG: remove melodic wrapper assertion that input is nifti

Closes #377

See merge request fsl/fslpy!321

MNT: pre-minor-release version bump

See merge request fsl/fslpy!319

DOC: changelog

See merge request fsl/fslpy!318

DOC: Fix custom css code - the previous approach seems to have caused

See merge request fsl/fslpy!317

something to break in a recent sphinx / sphinx-rtd-theme version [skip-ci]

MNT: Rudimentary support for JPEG 2000.

See merge request fsl/fslpy!316

type

ENH: wrapper for `fslorient` tool

See merge request fsl/fslpy!315

Bf/wrapper tempfile

See merge request fsl/fslpy!313

Rf/strict json

See merge request fsl/fslpy!312