Render clefs in the middle of a measure

[saebekassebil]

Hey guys,

I'm trying to get some different lead sheets rendered, and I'm actually doing quite fine up till now. Trying to render "Footprints", by Wayne Shorter, with a clef-change from measure 20 to measure 21, I just can't figure out a way to place the clef properly (at the end of measure 20, and again at the beginning of measure 21).

Is it not possible to render a clef, just like a regular StaveNote in some way?

(Maybe related to #23), Regards
Jakob Miland

[Silverwolf90]

This was added in pull request #149