[0.6.x PATCH] Make output logging to file usable on *NIX platforms

[Dan Williams]

Add a .config option for enabling the output logging, and add a
command-line option for turning this on or off (output is logged to
stdout by default still).  Also set the buffering mode to line-buffered
on *NIX platforms so that output shows up in a reasonable timeframe.
Otherwise it gets buffered in 4096 byte chunks (or whatever the C
library uses for buffer sizes) and doesn't get written in a useful
amount of time.

Dan

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