[MERGE] Support 3 noise levels in commit

[Ian Clatworthy]

This was discussed some time back here:
https://lists.ubuntu.com/archives/bazaar/2007q2/027044.html. As that
thread indicates, everyone who voiced an opinion agreed at the time.
Let's hope everyone still does. :-) (If not, you can always add an alias
for commit that switches --verbose back on by default.)

Running some profiling today, I noticed that 15% of an initial commit on
a Python tree (3726 files) was generating output even when output was
redirected to /dev/null. The attached patch implements the multiple
noise levels improvement and delivers better performance by using that
level information to skip generating info if we know we're never going
to display it.

Ian C.
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