Experimental metainfo based on nexus classes and nexus parser

• preparation of NEXUS examples
  • NXmx - Serial Crystallography Dataset (Lysozyme)
  • NXmx - Powder Dataset (LiO2Ti)
  • source code for NEXUS generation
• NEXUS writer with minimal dependencies
  • stripping
  • code cleaning
• NEXUS reader based on nxdl application definition
  • checking with NXmx test case
  • generalisation
  • code cleaning
• NEXUS parser
  • Initial parser with NEXUS reader
  • mapping NEXUS data to metainfo
  • connects metainfo with data in HDF5
  • NEXUS application definition dependent normaliser
• NEXUS application definition for 4D stem
• NEXUS data from 4D stem
• NEXUS 4D stem data in NOMAD