Add "debug" support

[whitlockjc]

It would be nice to know exactly where data is read from the M8 files to help other tooling authors to know the structure of these M8 files. The easiest way to do this would be to use the debug module to debug these details. Another thing we should do is to add a skip method to the M8 file reader to help in identifying where data is skipped because it's unknown or unused.