scp: missing progressbar, better behaviour on small windows

["Uwe Räsch"]

I miss the stars when doing scp. My suggestion for progressmeter.c makes scp to
display different fields on different terminal widths. Maybe this is useful for
you.

Once in "start_progress_meter()" the outlook of the progressline is calculated.
In "draw_progress_meter()" sprintf() instead of snprintf() together with some
strlen()'s can be used, because the buffersize has been respected before. The
remaining time can now have the form "> 99 days", "11d12:44" or as before
"22:33:44" and "   33:44".

Okay, with 80 columns the filename is displayed with only 24 characters instead
of the 45 in the original code after 2002/12/13, but using 121 columns should
not be a problem today.

(See attached file: progressmeter.c)
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