[MERGE][328007] Fixed problem with `log -p` and non-ascii content of files: show_diff should write the diff to exact [stdout] stream.

[Ian Clatworthy]

Alexander Belchenko wrote:
> This patch provides fix for bug #328007: log -p on non-ascii files crashed with unicode error.
> I wrote this patch by Ian request (actually I wrote 2 variants of patch).
> Now I've added simple smoke test. This test failed with unicode error without my patch
> and succeed with it.
> 

Alexander,

Thanks very much for putting this together. I had been meaning to get to it but
it just hasn't made the top of my list this week with my focus on testing/tweaking
the new brisbane-core code and wrapping up content filtering while the sprint is on.

Ian C.