Keeping a single changelog file creates annoying conflicts when rebasing
the -S version. To eliminate these, keep the changelog for each version
in a separate file and also create files for the -S versions to include
them in the docs. In the open source version, these files will remain
empty and thus won't affect the documentation, while in the -S edition
they'll be filled in and included without introducing any conflicts.
f80d4d8367
