Add version 3 of FRD event header and cleanup accessors.
Major cleanup of FedRawDataInputSource.
Add getter for pointer to payload.
Fix a couple of bugs and support any FRDEventMessage version.
Add Adler32 check.
Cannot rename files accross file system boundaries.
Merge pull request #1496 from mommsen/ImproveInputSource

DAQ improvements -- Improve FedRawDataInputSource input source