Re: Adds longas, maximas and non-standard tweaks to MultiMeasureRest (issue4536068)

[pkx166h]

Passes Make and there is a reg test difference which looks ok. I created
a tracker

http://code.google.com/p/lilypond/issues/detail?id=1794

so people can see this but also because this has been going on for a
while and the tracker will at least keep this on people's radars.

http://codereview.appspot.com/4536068/