Update DC sweeper to be a bit more general.
Update DC sweeper to be a bit more general.

Note, this breaks the previous BBNDC interface. But, it was lousy, so
who cares...

--BRJ

Plourde-Research-Lab/Qlab,BBN-Q/Qlab,Plourde-Research-Lab/Qlab,rmcgurrin/Qlab,Plourde-Research-Lab/Qlab,rmcgurrin/Qlab,rmcgurrin/Qlab,rmcgurrin/Qlab,BBN-Q/Qlab,BBN-Q/Qlab,BBN-Q/Qlab