Patch looks good; I've just got one more small suggestion.

The variable 'some_applied' in mq_patches_applied isn't really necessary
- it would be clearer if you just said:

    return st.returncode == 0 and bstdout

after the call to st.communicate().


> Interesting: I saw that repetition but due “[…] Ideally, it
> should distinguish between this and other errors by checking the
> subprocess's stderr, so that if a different error occurs, we can still
> print out the error message. […]” I just wanted to keep cmd's separated > first :-)

When I said that, I was referring to the 'hg qapplied' command (not the
'hg status' one), but I can see how it might have been confusing ;)