Contains the column descriptions and data for the datatable part of a GEO object
Objects can be created by calls of the form new("GEODataTable", ...).
columns:"data.frame"
      containing information about the columns in the datatabletable:"data.frame" containing
      the actual datasignature(object = "GEODataTable"): get the
      column portion of the GEODataTablesignature(object = "GEODataTable"): get the
      table portion of the GEODataTablesignature(object = "GEODataTable"): convenience
      show method