Harmonize private data and NetCDF output?
Right now some elements (and probably some nodes) allow access to private data and output similar data in NetCDF using different names. An example I recently stumbled upon is the total joint, which outputs the (relative) angular velocity between the two parts as the vector "Omega", but supports access to the same datum as "wx", "wy", and "wz". We could harmonize this by supporting also the NetCDF names to access private data, saving the original names as legacy, and possibly deprecating them.