R1:872bcd4487e6

Make limits and ranges work better with Calendar event queries

Summary:
Fixes T8911. This corrects several issues which could crop up if a calendar event query matched more results than the query limit:

- The desired order was not applied by the SearchEngine -- it applies the first builtin order instead. Provide a proper builtin order.
- When we generate ghosts, we can't do limiting in the database because we may select and then immediately discard a large number of parent events which are outside of…