decoding support for unsupported, user-agent, warning, www-authenticate

 update TC_DBLREQ to return pass and ignore the second message (this is a SA issue)
 

 fixed TC_NOVELSC to reflect the new way of decoding urls
 

 decoding support for route, server, subject, supported, timestamp
 list of field that can appear multiple times extended

 raise an error when a field is duplicated
 

 transformed TC_MCL01 into a negative testcase
 

 added value check for TC_UNKSM2
 

 support for repeated header fields (including authorization)

 fixed bug in previous commit

 absoluteURI moved to UserInfo
 support for multiple occurrences of the contact field

 correction in header fields that can occur multiple times

 transformed TC_INSUF into a negative test

 fixed memory leak

 support multiple via in the same line

 decoding support for organization
 userinfo regex corrected

 decoding support for in-reply-to, mime-version, min-expires

 decoding support for date, error-info and expires

 added value check for TC_REGAUT01

 added value_check for TC_NCL

 fixed empty string int TC_NOREASON

 decoding support for content-language

 decoding support for content-disposition
 improved decoding of semicolon-separated parameter list

 decoding support for call-info

 decoding support for authorization

 added value check for TC_UNKSCM

 added value check for TC_TRANSPORTS

 added value check for TC_SDP01

 added value check for TC_NOVELSC

 added value check for TC_NOREASON

 added value check for TC_MISMATCH01

 added value check for TC_LWSSTART

 added value check for TC_LWSDISP

 added value check for TC_LONGREQ

 decoding support for allow, authentication-info and comma separated parameter list

 added value check for TC_INVUT

 support for Request-Route

 added value check for TC_INV2543

 support case-insensitive matching of header names

 added value check for TC_PARAM02

 added value check for TC_CPARAM01