This is a preparatory commit for using isort for sorting all of our
imports, merging changes to files where we can easily review the
changes as something we're happy with.
These are also files with relatively little active development, which
means we don't expect much merge conflict risk from these changes.
This index is essentially free, since it only consumes resources for
starred messages, and massively improves the performance of the
"starred messages" narrow.
Tim Abbott
Anders Kaseorg
rht
Steve Howell