Build 51

- added    : url header 'accept'
- bug fixed: some conditional arguments were disabled by the automatic addition of the scope
- bug fixed: datenumber urldate was not properly calculated (timezone problem)
- changed  : support for half hour timezone
- changed  : forward looking dst mode is now default. To switch back to old style mode=f
- bug fixed: in setting the scope.range when the first ( char occurs without a | char. (As in cleanup tags)
- bug fixed: in GetInsertMode when only one channel and a show needs to be inserted before the none existing second channel
- added (experimental) : Regex Operations and Regex scrub