PPI: Implement throttling
PPI: Implement ModuleManager and ppi::init
PPI: Implement ThresholdQueuing
PPI: Hugely extended routing classes

PPI: Add RateStuffer image to documentation

PPI: Some small bugfixes to make ppitest work (not only compile :-) )
PPI: Add DebugModules

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

Packets: Document DataPacket, safe_data_iterator and exceptions
Packets: Move bundle documentation out of the Packets documentation
Scheduler: Make test more robust (add sleep ...)
Move all local dictionary words into senf.dict

* Place all modules in the senf::ppi::module namespace
* Place all connectors in the senf::ppi::connector namespace
* Name input modles 'Reader', output modules 'Writer'
Added specification for SocketReader / SocketWriter and PassiveQueue
Removed three-argument connect() form

Layout update