SONFilter

  SONFILTER tests whether a set of markers are included in the set defined
  by a filter mask

  Implemented though SONFilter.dll

  ANS=SONFILTER(MARKERS, FILTERMASK)

  INPUTS: MARKERS is EITHER
              1. a TMarker structure as defined in the SON system
                or
              2. a 4-byte uint8 vector containing the marker values
          FILTERMASK is the filter mask structure
  OUTPUTS: 1= the markers are included in the filter mask,
                   0 otherwise

  Author:Malcolm Lidierth
  Matlab SON library:
  Copyright © The Author & King's College London 2005-2006