REF: replaced ambiguous exists method with on_disk and defines

See merge request fsl/fslpy!128

ENH: update fslversion call for the future :hash version

See merge request fsl/fslpy!127

Enh atlases

See merge request fsl/fslpy!126

these return 3D images with the binary or probabilistic mask
in a new image.Image with the name set to the label name
and the same NIFTI header as the atlas

makes the output

MNT: post-release verbump

See merge request fsl/fslpy!125

Doc/apidoc

See merge request fsl/fslpy!123

Enh/resample

See merge request fsl/fslpy!122

transform.decompose test

resampleToPixdims and resampleToReference

package). Refactored, cleaned up, and enhanced to accept an arbitrary affine
transform - can be used to resample an image into any other space.

alignemnt of the input and resampled images to be adjusted.

Check invalid characters in trees

See merge request fsl/fslpy!121