Re #6771 cleaned up. new branch.
Re #6771 commited mcstas_event.vtp by mistake
Re #6771 added pathOfType method
Re #6771 New nexus file format
Re #6771 Test with the new ILL nexus format
Re #6771 pathOfType is a const method
Re #6771 Test with the new ILL nexus format
Re #6771 Put common functions in LoadHelper
Re #6771 Cleaning up loaders. Use loadhelper instead.
Re #6771. Change file for performance test to the one that exists now.
Merge remote-tracking branch 'origin/feature/6771_ILL_D33'