86a43985

By: Greg Pfeil <greg@technomadic.org> 

Extend `CyclicCalendar`

This adds two more primitive operations to `CyciicCalendar`: `cycleLength` and
`ordinal`, which then allows a default implementation of `onOrBefore`.

It also generalizes a number of previously `DayOfWeek`-specific operations to
work for any `CyclicCalendar`.
Tree Timing
configuredevShellghc9102ghc9103ghc9122ghc948ghc967ghc984defaultghc9102_allghc9103_allghc9122_allghc948_allghc967_allghc984_allx86_64-linux

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