Excessive text being printed to console

[ArtPoon]

We should add a verbose option so that messages like Scanning triplet (x / n) are masked by default

[ArtPoon]

Another option is to use backspace characters to replace the printed line to update the progress messages (I think this requires using sys.stdout.write instead of print

[terrycojones]

This works pretty well https://github.com/niltonvolpato/python-progressbar

[ArtPoon]

Thanks @terrycojones - I would like to minimize the number of dependencies and I've already implemented progess bars in other code, so I think it will be easier for us to just reuse that code!