Load CIF file from Nomad
Implement load CIF in Nomad: so that no need to do it in vEXP
- lattice is loaded and current file is stored in a dedicated place (e.g. .nomadserver)
- vEXP must be able to load the file
- an id must be provided in spy data to identify the last loaded file
- how to pass the content of a file from Nomad to vEXP: do like the client with load file (add the functionality in nomadaccessor)