Hello... emacs-beancount is broken because it's no longer just bundled
in beancount.  However, I've attached a fix.

If nobody has any problem with this I'll just push it up to master.
Since it's a leaf package, and the current state is "it's broken" I
figure it's probably fine to push, but since it's a significant
refactoring thought I'd ask for a review before I did so.