This PR fixes a bug in the `LinearOrderPackage.ofOrd` factory. If there
is a `LawfulEqOrd` instance available, it should automatically use it
instead of requiring the user to provide the `eq_of_compare` argument to
the factory. The PR also solves a hygiene-related problem making the
factories fail when `Std` is not open.
This PR adds useful declarations to the `LawfulOrderMin/Max` and
`LawfulOrderLeftLeaningMin/Max` API. In particular, it introduces
`.leftLeaningOfLE` factories for `Min` and `Max`. It also renames
`LawfulOrderMin/Max.of_le` to .of_le_min_iff` and `.of_max_le_iff` and
introduces a second variant with different arguments.
This PR provides factories that derive order typeclasses in bulk, given
an `Ord` instance. If present, existing instances are preferred over
those derived from `Ord`. It is possible to specify any instance
manually if desired.
This PR provides the means to quickly provide all the order instances
associated with some high-level order structure (preorder, partial
order, linear preorder, linear order). This can be done via the factory
functions `PreorderPackage.ofLE`, `PartialOrderPackage.ofLE`,
`LinearPreorderPackage.ofLE` and `LinearOrderPackage.ofLE`.
