Small SCons V0.96 compatibility fix

PPI: Fix cloneSource unit-test packet construction
Scheduler: BUGFIX: uninitialized loop variable
Scheduler: BUGFIX: delay deletions in fdTable_ (can't change map while iterating over it)
Add global 'valgrind' target
Add 'valgrind.sup' suppressions file to suppress custom benign valgrind errors
Fix all unit-tests to run correcly under valgrind (mostly timing adjustments)

Scheduler: Daemon class: Implement default argument parsing

Scheduler: Hack suppoer for ordinary files into the scheduler (epoll does *not* support ordinary files ...)
Scheduler: Daemon class: Add consoleLog (log file) support

Scheduler: Daemon class: Fix DaemonWatcher to not drop info from stdout/stderr when the child terminates
Scheduler: Daemon class: Replace all ::exit() calls in the daemon watcher with ::_exit()

Scheduler: Add debug log message, fix signal handlin bug
Scheduler: Remove all registered handlers/callbacks/descriptors at end of unit test
Utils/Logger: Undef SENF_LOG_CONF if defined in main.test.hh
Scheduler: Moved Daemon class from Utils here. Can't be in Utils since it depends on the Scheduler :-(
Scheduler: Daemon class: Implemented correkt fork() and simple log-passing behaviour

Scheduler: Elaborate more on boost::bind usage
Utils: Start senf::Daemon base class
Utils/Logger: Make ConsoleTarget a singleton
Utils/Logger: Introduce fallback routing

Scheduler: Simplify callback parameter (remove mostly ignored callback handle parameter)
Scheduler: Add timeoutEarly and timeoutAdjust parameters

Utils/Logger: Add Alias documentation
Scheduler: Add scheduler based logger time source

Utils: Implement ErrnoException

Fix TAGFILE dependencies
Fix some URL references
PPI: Add additional 'route' documentation
Globally disable SUBGROUPING in Doxygile.global

Packets: Fix PacketImpl::updateIterators implemantation (don't access invalidated iterators)
Scheduler: Remove access to invalidated timerMap_ iterator
Socket: BUGFIX: Fix generic WriteRange implementation

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

Scheduler: Bugfix in ClockService.test.cc: restart ClockService after test so further test's don't fail

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

Scheduler: Implement ClockService clockSkew detection / fixup

PPI: Implement IntervalTimer event
Scheduler: Change timeout() argyument to absolute time represented as ClockService::clock_type
Scheduler: Implement timer event cancelation
PPI: Implement RateStuffer in ppitest

Packets: Silence PacketRegistry warnings with final=1
Utils: Remove MicroTime
Scheduler: Sart implementing more reliable timing mechanism

Socket/Protocols/INet: Add INet4Address documentation
Fix some missed INet4Address -> INet4SocketAddress renames
Fixed several std:string arguments to use std::string const &

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

* Allow empty FileHandle/SocketHandle etc instances
* Make ServerSocketHandle::listen depend on AddressingPolicy
* Replace all occurences of inet_ntoa with inet_ntop (thread safety)
* Fix handling of exceptions in ReadHelper/WriteHelper
* Fix Scheduler ERR/HUP semantics

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