MNT: Changes to support `micromamba`; remove `createFSLWrapper`/`removeFSLWrapper` scripts
Some small tweaks to work with micromamba
-based FSL installations. The createFSLWrapper
/removeFSLWrapper
are now installed by the fslinstaller.py
script (see https://git.fmrib.ox.ac.uk/fsl/conda/installer/-/merge_requests/101).