SI-4332 Plugs the gaps in views

These currently result in runtime errors:

    scala> List(1).view.distinct.force
    java.lang.UnsupportedOperationException: SeqView(...).newBuilder

    scala> List(1).view.inits.toList
    java.lang.UnsupportedOperationException: SeqView(...).newBuilder

Two tests are enclosed:

  1. reflect on the views to make any method that returns
     `Repr` is overriden in `*ViewLike`. This guards against
     new additions to the collections API.
  2. exercise the newly added overrides

Parallel collections views are not touched, as these are likely
to be deprecated or removed shortly.

Before this change, the test reported the following.
Not all of these methods were buggy. For instance, `sortBy`,
`sortWith` are implemented in terms of `sorted` which
was implemented in `SeqViewLike`. Even in those cases, I have
opted to override the methods in the `ViewLike` to guard
against changes in the base class implementation and to
simplify the rules in the test.

    ========================================
    Checking scala.collection.TraversableView
    ========================================

    trait TraversableLike
    ----------------------------------------
    def inits: Iterator[Repr]
    def tails: Iterator[Repr]
    override def tail: Repr
    def filterNot(p: A => Boolean): Repr

    ========================================
    Checking scala.collection.IterableView
    ========================================

    trait TraversableLike
    ----------------------------------------
    def inits: Iterator[Repr]
    def tails: Iterator[Repr]
    def filterNot(p: A => Boolean): Repr

    trait IterableLike
    ----------------------------------------
    def dropRight(n: Int): Repr
    def takeRight(n: Int): Repr
    def sliding(size: Int): Iterator[Repr]

    ========================================
    Checking scala.collection.SeqView
    ========================================

    trait SeqLike
    ----------------------------------------
    def sortBy[B](f: A => B)(implicit ord: scala.math.Ordering[B]): Repr
    def sortWith(lt: (A, A) => Boolean): Repr
    def distinct: Repr
    def combinations(n: Int): Iterator[Repr]
    def permutations: Iterator[Repr]

    trait TraversableLike
    ----------------------------------------
    def inits: Iterator[Repr]
    def tails: Iterator[Repr]
    def filterNot(p: A => Boolean): Repr
    def repr: Repr

    trait IterableLike
    ----------------------------------------
    def dropRight(n: Int): Repr
    def takeRight(n: Int): Repr
    def sliding(size: Int): Iterator[Repr]

    ========================================
    Checking scala.collection.immutable.StreamView
    ========================================

    trait SeqLike
    ----------------------------------------
    def sortBy[B](f: A => B)(implicit ord: scala.math.Ordering[B]): Repr
    def sortWith(lt: (A, A) => Boolean): Repr
    def distinct: Repr
    def combinations(n: Int): Iterator[Repr]
    def permutations: Iterator[Repr]

    trait TraversableLike
    ----------------------------------------
    def inits: Iterator[Repr]
    def tails: Iterator[Repr]
    override def tail: Repr

    trait IterableLike
    ----------------------------------------
    def dropRight(n: Int): Repr
    def takeRight(n: Int): Repr
    def sliding(size: Int): Iterator[Repr]