Handle reading of nexus file sin bimorph
bimorph: added other slit pos parameter as this was hard coded to move
to
0.
Add a prefix to extranames
Enable on setting ROI
Allow names to be configurable
Handle temporary errors in loading data from LoaderFactory
WARNING - needs checking for all beamlines

For NexusDatWriter the filename is <number>.nxs
Handle cases when outputFormat is not long enough