WIP: Load Workload + Platform + Events from Qarnot

What's working:

• Workload
  • Load ok
  • Understand the warning for duplicate jobs
• Platform
  • Load ok
• Events
  • Load ok
  • Match machine name in event with machine id
  • Handle all events
  • Fix input data: event with unknown machines ? ok to ignore unknown machines ?
  • Fix input data: event with no known machine ? ok to ignore the event ?
• Dataset
  • Load ok