Load modifies CommandID

I figured out that I like what I've done, locally, and to make dump/load work, all I need to do is to have load change the command id.

The Command Id is the timestamp of when the command started. Load just needs to map all occurrances of the same command id to the time when processing started on that command. It may be just that simple, or I may need to sort things by originating timestamp (if I don't already). In any case, the solution is now isolated to load processing and it can wait until I focus on dump/load/restore again. (OK, I've also got to update the navigating through time tutorial--its using a UUID rather than a timestamp.)