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This prevents unintentionally writing in the top-level data repo
by leaving off "--output" or "--rerun" or $PIPE_OUTPUT_ROOT. If
none of these is set, we error out. This behavior can be disabled
by setting ArgumentParser.requireOutput = False.
In the process, cleaned up the rerun handling, so that the actual
rerun name is stored in namespace.rerun instead of a directory.
Added a test demonstrating various ways of specifying the output
directory.