progressbar will open a window containing a text
label and a progress bar. The progress bar is
updated by reading newline-delimited integers from
STDIO. In addition, the text label can be updated
by writing a string to input. The purpose of the
script is to get an easy way of monitoring
progress of computations without having a
dedicated terminal window showing printed progress
information. Instead a small window with a
graphical display of progress is used with the
option of adding short strings for diagnostics.
