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This patch adds some additional commands, and implements corresponding
progress callbacks that produce output for the 'dialog' utility:
http://invisible-island.net/dialog/dialog.html



The simple "*-with-gauge" just emits percentage numbers, line by line,
while "*-with-xgauge" outputs extended information to update the
dialog prompt. Both are meant for directly piping the output:
sunxi-fel write-with-gauge <...> | dialog --gauge "FEL upload" 6 70
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>
Acked-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>