[merge] further progress bar fixes

[John Arbash Meinel]

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Martin Pool wrote:
> This fixes the bug in progress bars noted by John a while ago, and
> does some further cleanups there.  There is more still to do.
> 
> One question that came to mind here is whether we really want a stack
> of progress tasks, or a more general forest of trees.  You could
> certainly draw the latter in a gui.  However, it seems to make the api
> more complex, particularly if we want to get away from passing pb
> parameters down the call stack, which would be nice.  Also, without
> threads or some other asynchrony approach, I don't think we'll really
> seriously have many unrelated tasks going at the same time.
> 
> This stack is redundantly held by the ProgressTasks and the ui at the
> moment, and I'll fix that later.
> 
> I rename some of the ui_factory methods that are meant to be called
> only from the ProgressTask to make them more private.
> 

BB:resubmit

No patch attached.

John
=:->

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