* Remove exn:fail:cookie, since I’d rewritten the library code to
avoid using it.
* Correct docs for cookie-header->alist, to reflect not raising the
exn.
* Remove needless illustration of date from clear-cookie-header
example.
* Add new modules, docs, and tests in cookies/
* Server: parse Cookie header, make cookies, make Set-Cookie header
* User agent:
* parse Set-Cookie header
* save cookies
* make Cookie header
* interface for substituting better cookie storage
* Common functionality: validate cookie parts
* Add deprecation notice to old cookie lib
Test and validation cleanup
