code: function parse_BIFF2STR(blob, length, opts) {
  	var cell = parse_XLSCell(blob, 6);
  	++blob.l;
  	var str = parse_XLUnicodeString2(blob, length-7, opts);
  	cell.t = 'str';
  	cell.val = str;
  	return cell;
  }
docs: /* BIFF2_??? where ??? is the name from [XLS]