Velocity units are wrong in progress bar

[jklynch]

Running something like
RE(mv(dcm.c2_x, x.yz))
gives a progress bar with units "s/mm".

[tacaswell]

if things are tqdm tries to pick the ratio that "looks better". It looks like there is a way to control this by setting the bar format (https://tqdm.github.io/docs/tqdm/#format_meter)