This module provides a simple progress indicator for command line programs. You initialize a ProgressBar object with a brief description of what is happening and the number of things that need doing, and after each thing is done you call the object's update() method.
At the moment, this is presented to the user (on stderr) as a sequence of 50 hash marks (no matter how many things are being done).
Update the progress bar by one 'tick'. You should call this after completing each one of the 'items' included in the counter's total. The progress bar will be updated accordingly (at present, this means more text printed to stderr).