Scheduler: Fix documentation (main page)
Socket/Protocols: return ClockService::clock_type from timestamp()
Add 'Scheduler' library dependency to every user of the 'Socket' library

Examples/RateStuffer: documentation

Socket/Protocols/INet: Slightly optimized generic INet6Address algorithms
Utils: Add ios_all_saver to hexdump()
senfscons: Add automatic image-copy to Doxygen builder (fixes weird doxygen copy problem)
Socket/Protocols/Inet: Add ConnectedUDPSocketHandle