support matching escaped characters in header names

 do not remove escape sequences in non-generic parameters of via

 fixed value check in TC_SEMIURI with correct escaped string

 transformed TC_REGBADCT into a negative test

 added value check for TC_ESC01

 added a function to decode and normalise the escaped characters

 renamed the positive tortture testcases

 fixed TC_LONGREQ to remove double-quotes in the nameaddr field

 allow returning an undecoded value in TC_SCALAR* (all we need is a codec that does not crash)

 support for decoding quoted strings

 added function for normalising quoted strings
 
 TODO: how to represent unicode characters ?

 added value check for TC_SEMIURI

 renamed negative testcases

 added value check for TC_REGBADCT

 fixed the content of the message in TC_MPART01

 transformed TC_INV2543 into a negative test

 disabled TC_DBLREQ because it is not a codec issue

 transformed TC_CLERR into a negative test

 added value check for TC_BADVERS

 added value check for TC_BADDATE

 added value check for TC_BADBRANCH

 added the remaining torture testcases

 changed TC_NCL into a negative test

 use the value of the Content-Length as a prediction when decoding the message body to ensure that the content length does not mismatch

 throw a DecodeIgnoreMessage after displaying the error message so that the toolkit does not output anything

 improved the messages displayed

 dump a warning and the raw message if the codec is unable to decode a message

 updated the torture tests to handle the raw message in the payload field

 store the message body into the messageBody field and put the raw message into the payload field

 decoding support for RFC 5009

 removed spurious '?'
 

 Added missing import definition in testcase file

 added value check for TC_ZEROMF
 

 Fixed issue related to charstring in generator

 fixed TC_UNKSCM to match the new way of decoding a url with an unknown scheme
 

 Fixed two small issues in generator
 

 restored data file for TC_INSUF (accidentally deleted in r168)
 

 decoding support for RFC 4244

 transformed TC_TRWS into a negative testcase
 

 Added loopback test