If run inside mantidplot, this script will install the latest version of
wfm stitching. Might be possible to make this nicer yet, user still has
to know how to run this from within mantidplot. Also, do we want to have
this within the version control/package itself - I think that's a
circular argument since you need it to install the package in the first
place. Where should we put it instead (or in addition to?)