New progress bar...

[BoPeng]

We had a broken progress bar for -v1 because things are running in parallel and because it is difficult to know the number of substeps in advance. With the new zmq-based controller, it is possible to do this:

1. assign a random character to each step (the first character of the step id, or sequentially), say 'a'
2. for each completed substep, output A for completed and a for skipped ..

[BoPeng]

wrong repo.