A progress bar is used to convey the progress of a task. This package
implements a very simple textual progress bar.
See the module 'System.ProgressBar' on how to use the progress bar or build the
package with the -fexample flag for a small example program.
The animated progress bar depends entirely on the interpretation of the
carriage return character ('\r'). If your terminal interprets it as something
else than "move cursor to beginning of line", the animation won't work.