Improving Nexus loader

The Nexus loader currently assumes all the names of data fields in nxs files. It would be an improvement if the Nexus loader could

• scan nexus files
• auto assign data fields (if using a certain nxs standard)
• or at least allow the user to make a manual assignment

For this different nxs standards need to be considered and also a new gui has to be created. It would also be possible using configuration files to store a once created assignment configuration