Comment 6 for bug 523746

OK, There are three problems.

1. bzr diff shows filename in "utf-8" encoding.
    This is not bad if stdout redirected to file. But if stdout is console, bzr should encode with stdout.encoding.

2. bzr diff --using=prog fails when arguments contains non ascii char.

3. qbzr crashes when qsubprocess writes binary to stdout.
    I think qbzr should use decode with errors="replace" or errors="backslashreplace".