Utils: Rename SafeBool to safe_bool (hmm ...)

Fix dependency generation for built programs
Fix depenfencies for auto-generated sources

Add 'fixlinks' target and add 'fixlinks' to the auto-build
PPI: exchange registerEvent arguments
PPI: Add connector 'operator()' aliases
PPI: More detailed 'route' and 'registerEvent' documentation

Make all include path's relative
Add 'senf/Packets.hh', 'senf/PPI.hh' and 'senf/Socket.hh'

Utils: Implement mpl.hh metaprogramming helpers

Examples/RateStuffer: Use CloneSource module
Exmaples/RateStuffer: Implement using a RateStuffer subnet
PPI: Implement CloneSource
PPI: Add throttle()/unthrottle() to passive debug modules
PPI: Implement DiscardSink
PPI: Implement ThrottleBarrier
PPI: Implement missing unit tests
PPI: Complete the documentation
Scheduler: Improve ClockService performance and remove a race condition
Scheduler: Clean up Scheduler::process()
Utils: Make singleton::instance() protected by default and fix implementation
Remove private members from doxygen documentation

PPI: Add documentation
Utils: Make Logger macros define empty stub types

PPI: More documentation
PPI: Implement IdleEvent and ActiveFeeder
PPI: add Module::running() member
Scheduler: Remove MinTimeout (not needed with ClockService working)

PPI: Add boolean test for debug modules

PPI: Fix PassivePackeSink: provide front() instead of back() members
PPI: Provide specializations for void-argument callbacks in Events and Route
PPI: Add notifyThrottle/notifyUnthrottle to EventDescriptor
PPI: Re-implement routing classes using a traits-based implementation
PPI: Add Route unit testing (mainly testing throttling)

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

* 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