Added a test file with dark and flat field as seperate items in the NeXus file
Added a test file with dark and flat field as seperate items in the NeXus file

mjn19172/Savu,mjn19172/Savu,mjn19172/Savu,mjn19172/Savu,swtp1v07/Savu,swtp1v07/Savu,mjn19172/Savu,swtp1v07/Savu,swtp1v07/Savu