Log Message:
Update to yet-3.15. Previous distfile is gone and can't be redistributed.

New Features
  The Circular and Radial layout algorithm as well as Balloon and all Directed
  Tree layout algorithms support a new edge routing style where edge paths are
  bundled to prevent visual clutter.

Bugfixes
  Disabled menu interaction on Mac OS X during layout runs to prevent
  accidental graph structure modifications.
  Many bugfixes, great and small.