TEST: Unit test fsl_anat wrapper

See merge request fsl/fslpy!106

Mnt/meta

See merge request fsl/fslpy!108

MNT: Pre-post-release version bump

See merge request fsl/fslpy!107

filetree query

See merge request fsl/fslpy!100

default to returning a flat list of matches. subtree-related fixes to scan
function

operators to Match class so it can be ordered. Protect Match attributes via
@property

mutate canonical version

for which an optional variable is not present

actually exist on disk (and corrsepond to files).

Fslsub update

See merge request fsl/fslpy!105

Expand trees

See merge request fsl/fslpy!104