Keep jslint happy
grammar: Dedupe SIP_URI/SIPS_URI rules
rfc4475: test the right thing in 3.3.12.
grammar: add _SIP_URI_noparams for Contact/From/To

See http://tools.ietf.org/html/rfc3261#page-161

   The Contact, From, and To header fields contain a URI.  If the URI
   contains a comma, question mark or semicolon, the URI MUST be
   enclosed in angle brackets (< and >).  Any URI parameters are
   contained within these brackets.  If the URI is not enclosed in angle
   brackets, any semicolon-delimited parameters are header-parameters,
   not URI parameters.