Allow disabling of Validation#flatMap deprecation warning by `import Validation.FlatMap._`.
IList.fill test
optimize IList.fill
Merge pull request #637 from S11001001/topic/validation-flatmap-optdeprecate

Allow disabling of Validation#flatMap deprecation warning
Unapply.AuxA, idea borrowed from shapeless.
Add onF to Leibniz/Liskov, onCov/onContra to Leibniz.
Leibniz#apply
Several simplifications due to new Leibniz functions.
optimize IList#span, splitAt, takeWhile
Setting version to 7.1.0-M5
Setting version to 7.1.0-SNAPSHOT
Test inference of new Leibniz methods.
Initial Data.Set port.

Signed-off-by: Gary Pamparà <gpampara@gmail.com>
Rename and initial tests (for laws)

Signed-off-by: Gary Pamparà <gpampara@gmail.com>
Added initial round of tests for ISet

Signed-off-by: Gary Pamparà <gpampara@gmail.com>
Remove reference to missing funciton.

Signed-off-by: Gary Pamparà <gpampara@gmail.com>
Convenient subst/lift alternatives for Leibniz, Liskov. (#640)
Add final modifier and @tailrec

Signed-off-by: Gary Pamparà <gpampara@gmail.com>
Added documentation to `map`.

The `map` function, although implemented in `ISet`, does not mean that
`ISet` is a `Functor` instance. It does not implement the required
composition law - due to the restrictions required on the `Order`
instances.

Signed-off-by: Gary Pamparà <gpampara@gmail.com>
optimize IList#take