We really should finally compressChanges and condenseSources for this
release.  The last time we spoke about this, I believe we said we want
to:

  1) current changes merged into .sources.
  2) exclude leaves in history (methods with no descendants)
  3) except the current one of course
  4) all prior history with descendants is kept

Did I say that right?  We need a volunteer to look into this.

Thanks!