* [DCG_ASCII,FIX] Order uppercase letters before lowercase ones (since they have lower codes).
* [RFC2234,NEW] Added the basic ABNF rules defined in RFC 2234 as DCGs.
* [RFC2616_BASIC,SC] Simplified code by reusing RFC2234.
* [RFC3986,NEW] Added streamed URI-encoding DCG.
* [RFC4234_BASIC,SC] Simplified code by reusing RFC2234.
* [RFC4234_BASIC,SC] New module, merely reexporting RFC2234.