needed for python 3.5

Mnt/drop py2734

See merge request fsl/fslpy!75

work to do here

this is all handled by nibabel. Also never keeps its own ref to file object.
Image.save always saves to a temp file, then moves that to the destination -
avoid any problems with mmap/indexed_gzip.

wxpython dependency

MNT: Post-release version bump

See merge request fsl/fslpy!74

Mnt/fsl ents

See merge request fsl/fslpy!73

removed conda stuff from setup_ssh.sh