scCheckChannels

  scCheckChannels checks for unexpected conditions in sigTOOL data

  Examples:
  errm=scCheckChannels(fhandle)
  errm=scCheckChannels(channels);

  ERRORS
  "The units field for the timestamps is not equal for all channels"
      Although sigTOOL channels are independent of one another, many sigTOOL
      functions assume that the tim.Units field will be equal for all channels.
      If they are not, there is a risk of getting erroneous results


  WARNINGS
  "The number of points in Npoints does not correspond with tim"
       The number of points indicated in the channel header for one or more
       epochs, on one or more channels, does not match with the timestamp
       data for the channel.