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This reverts commit cc0bb76c.

If no -r argument supplied catch exception and print message (and help).
If bad arg, suggest running with --help (does same as -h)

This reverts commit 73c24446.

move support functions to ScanHelper, separate data from code in preparation of introducing a class ScanConsole

This is an AnalysisAlgorithm that saves histograms generated
by HistogramAlgorithm. Similarly to DataArchiver, we have to
somehow pass an output directory into the class.