[merge] show .bzr.log location in version output

[Aaron Bentley]

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Martin Pool wrote:

> On unix it's easy to do 'less ~/.bzr.log', but many people who need
> debugging help on windows first need to dig around to find the log
> file, and this will save some hassle.

If we're doing this, we might as well list the config directory, too.
That will also help with debugging on win32.

Aaron
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