Progress Bar for Event Loop

Simon Spannagel requested to merge progressbar into master

This MR adds a (optinal but enabled-by-default) progress bar to the event loop:


It is mainly plain ASCII but uses some Unicode characters (partial blocks) to achieve a smoother movement of the bar head. Not sure how that works with all sorts of terminals though - @kwolters any idea?

I added a framework parameter progress_bar which defaults to true but allows to disable the new bar and revert to the old situation. This MR fixes #22 (closed) just 3 years and 3 months after its listing.

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