Modified combinators in hash.rkt to better conform with comparable combinators in Racket.
Modified combinator constructions in Motile/generate/baseline.rkt to accommodate increases in the number of arguments for functions supplied to hash combinators. Modified Motile/baseline.rkt to reflect new primitives defined in .../generate/baseline.rkt for the sake of hash combinators.

Modified compile-test.rkt to update regression tests for hash tables.
Modified hash.rkt to simplify serialization of hash tables.

Modified serialize.rkt  to guarantee that serialization and deserialization of hash tables reflected the insertion order of key/value pairs. This is required to guarantee consistent signing of CURLs.