Re: Align metronome mark at time signature or first musical element. Fixes #684. (issue1579041)

[reinhold . kainhofer]

First, great to see that this feature has finally been implemented and
pushed.
Unfortunately, it seems that it needs some small tweaking, still. The
problem is that the metronome mark is now placed directly above the key
signature, while Gardner Read says that it "is aligned over the meter
signature, or -- if none is present -- over the first notational element
of the measure, such as note-heads, accidentals, repeat signs, and so
on." (Gardner Read, p.278)

So, it should never be aligned with the key signature, but rather with
the time signature or the first element after that... Actually, Gardner
Read shows an example with a key signature and a metronome mark, where
the metronome mark is really aligned with the time signature and not
with the key signature...

http://codereview.appspot.com/1579041/