2.13 default beaming rules need support for tuplets

[Nick Payne]

Also, all the commercial scores I've seen have one tuplet indication per 
beam (usually omitted after a couple of beams/bars), not a single tuplet 
indication spanning multiple beams/bars. Shouldn't the default tuplet 
indication be what is regarded as the standard?

\version "2.13.9"

changeBeaming = \overrideBeamSettings #'Voice #'(3 . 4) #'end #'((* . (3))
        ((1 . 8) . (2 2 2))
        ((1 . 12) . (3 3 3))
        ((1 . 16) . (4 4 4))
        ((1 . 24) . (6 6 6))
        ((1 . 32) . (8 8 8))
        ((1 . 64) . (16 16 16))
        ((1 . 128) . (32 32 32)))

\relative c'' {
    \time 3/4
    c16 c c c c c c c c c c c
    \times 2/3 { c16 c c c c c c c c c c c c c c c c c }
    \changeBeaming
    \times 2/3 {
        c16 c c c c c c c c c c c c c c c c c
        c16 c c c c c c c c c c c c c c c c c
    }
    \set tupletSpannerDuration = #(ly:make-moment 1 4)
    \times 2/3 { c16 c c c c c c c c c c c c c c c c c }
}

test.png
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