added the acc and data parameters; simplified the id method; moved some sanity checks to the init method (from the data_op method); in the init method, better handlng of empty data; in the datamod data_op, better handing of empty data and fixed a bug with the object metadata being lost; implemented the load-stats data_op for acc data; implemented the stats data_op for acc data
added the acc and data parameters; simplified the id method; moved some sanity checks to the init method (from the data_op method); in the init method, better handlng of empty data; in the datamod data_op, better handing of empty data and fixed a bug with the object metadata being lost; implemented the load-stats data_op for acc data; implemented the stats data_op for acc data

jgte/orb,jgte/orb,jgte/orb,jgte/orb,jgte/orb