BLXVI-117 (8.38) Fixed regression with ScanDataProcessorResult
(8.38) Added getMeta method to metadata.py that gets metadata from the relevant source.
(8.38) Added setFilePrefix method to IncrementalFile to match the functionality offered by NexusDataWriter's SRS file functionality.
(8.38) - Changed NexusDataWriter to no longer require description/type/id strings.
(8.38) Removed unsupported method from NexusDataWriter (nobody was using it).
(8.38) Added debug message to log if NexusDataWriter.makeMetadataScannableFallback fails when creating group (previously it was silently ignored).
BLXVI-134 (8.38) - workaround for the fact that
AbstractContinousScanLine sets HardwareTriggering to false before
atScanEnd is called