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A double goodness whammy involving type inference at the borders.
1) Implicit search preserves singleton type fidelity. 2) Unification of
parent bounds is (closer to) correct.
Result of 1: "implicit def f(x: Foo.type)" will convert object Foo.
Result of 2: "new Trait[Int] { }" may enjoy its type constructor being
inferred, no longer foiled by the anonymous class.
Also included are some clarity-enhnancing renamings and refactorings.
Performance note: I heavily benchmarked the change to isSubArgs and it
is reproducibly faster than the previous implementation. Numbers and
methodology available upon request.
Closes #2693, #3964. Review by moors, who wrote most of this patch but
might like to review the comments.
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