[publishing] Added Dix Bransles de Champagne, by Claude Gervaise.

There’s really a lot to be said for being able to play lots of dances
together without page turns. And to do that, you need parts rather
than scores. And the Cantabile Renaissance
Band has some members who’d like to play more dance music. So I
might be doing more of both the Gervaise and the Susato in partbook
format.