- new class names SystemProgressMorph and SystemProgressBarMorph
- does not touch the old ProgressMorph class
- added class comments
- renamed a ambiguous method
- removed bad example and added a better one
- removed cranky postscript

from preamble:

"Change Set:		NewProgressBar
Date:			9 April 2004
Author:			Alexander at Lazarevic.de

A different progress bar will be displayed for MVC and Morphic. This
also ensures that a progress bar gets removed. In Morphic progress bars
get stacked, the most recent one is at the bottom.

This changeset makes the DefaultProgressBar changeset obsolete.

Thanks Karl, Dan and Yoshiki for advice on how to make things faster or
look better"!
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