Pull latest KEEPS master changes to OPF keeps-master branch.

KEEPS repo originally forked from OPF master. Keeps now has conflicts with the 0.8.3 version of the harvard-lts master branch. Pulling a copy of the KEEPS master to an @openpreserve/fits keeps-master branch.

There's also incoming work from PSNC, the aim is to merge these into the latest Harvard release (0.8.3).