Lily 2.7.13 released

Hello,

I'm uploading 2.7.13 as I write this.

    * This release features slashed numerals, plus signs and
      interruptible extender lines for figured bass. Merging of Figured
      bass lines has been made switchable with the
      figuredBassCenterContinuations property.

    * Subproperties, like the `details' field of `Slur' and `Tie' may
      now be tuned with `\override'. For example,

      \override Stem #'details #'beamed-lengths = #'(4 4 3)

      shortens the stems in beams.

    * For each grob, a subproperty in `callbacks' property defines the
      procedure which computes it. This is major internal cleanup, which
      also provides advanced tweakability for power users. For example,

      \override Beam #'callbacks #'direction
        = #(lambda (grob)
            (if (> 4 (ly:grob-array-length (ly:grob-object grob 'stems)))
                DOWN
                UP))

      With this code fragment, the direction of a beam is decided to be
      up or down, depending on the number of stems in the beam.

In short, 2.7.13 has had some brain-surgery done. Expect some glitches 
if you use this version.


The MacOS and Fedora packages are available. Windows and Linux/x86 
packages will follow, hopefully soon.

-- 
  Han-Wen Nienhuys - [email protected] - http://www.xs4all.nl/~hanwen