- Assume that Learning Sequences is available (waffle has been
removed)
- Stop calling course blocks API, which provided mostly duplicated
information now.
- Refactor a bit to avoid needing to globally know which units
exist in sequences. That is now provided just-in-time for only
the current sequence.
- Add /first and /last URLs that you can use instead of unit IDs
in URL paths, in service of the above point.
AA-1040
AA-1153