Kyle Evans 8acbb227d9 dd: Incorporate some changes from imp for status=progress
Notable changes from what landed in r337505:
- sigalarm handler isn't setup unless we're actually using it
- Humanized versions of the amount of data transferred in the progress
  update

Submitted by:	imp
Reviewed by:	kevans
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D16642
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