2.13.41 and near future

[Graham Percival]

Since GUB master still cannot build lilypond due to that target_cpu
error, I've reverted my local tree back to
    2a8f076a015ac06b37a7f86537cf47691e65e745
which is the commit we used for 2.13.40.

Carl, Neil, and Valentin have made great progress on the volleyball
regression bugs.  I'm going to bow out for the next few days in order
to fix 1363 (no help needed for that one) and do other misc
release-oriented tasks.  I encourage anybody who knows how to compile
lilypond and apply a patch to help out with the volleyball-playing --
working together on a specific bug is a very different feeling from
working by yourself on one aspect of a shared project.

Cheers,
- Graham