MFC r175118: when the ms/req fields exceed 1 second, drop the fractions
to fit more digits.
MFC r183665: batch mode.
MFC r189738: fix man page sinopsys; remove BUG section.
MFC r189739: turn the batch mode on if stdout is not tty.

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_M gstat
M gstat/gstat.c
M gstat/gstat.8