bzr fast-import-filter ready for early adopter testing

[Ian Clatworthy]

Alexander Belchenko wrote:

> OK, it seems working on small dataset, but I have several problems on
> Windows with bzr.exe
> 
> 1) bzr-fast-export should be available as bzr command

Done. Try rev 122.

> 2) either git-export format does not allow CRLF line-endings, or fastimport
>    commands has problems to read the CRLF stream properly
> 3) I think fast-export and fast-import-filter should emit the stream in
> binary mode
>    on Windows.

I've cherrypicked your fix from your branch. Thanks! Maybe something
similar is required in the fast-export command?

Ian C.