Grab a new accession number in case we want to use the same
value for all studies. This was a twist for the RSNA 2013 Image Sharing
demonstration. It will not be used, but there is no harm in generating
a new number for each patient registration.
Changes for RSNA 2013 Image Sharing demonstration.
- Add mirros to DCM systems to allow us to send RAD 2, 4, 28
to mirrors.
- Change RAD 2 to send status = CM (complete). Need to correct that.
- Add a configuration flag for acceptsCompleteMessage. This is
  for DCM systems, and we need that in addition to RAD 2, 4, 28.