Utils/Exception: message() does not include backtrace informations
fixed some documentation

Scheduler: Add ClockService::from_time_t and from_timeval
Utils: Implement generic backtrace helper
Utils/Daemon: Catch fatal signals (plus SIGUSR2) and show a backtrace in debug builds

Console: Pass ParseCommandInfo instead of ArgumentsRange to the callbacks
Console: Add named aliases for operator overloads ('[]' and '()')
Utils: Document, where impl/demangle.h comes from
Updated the 'Setting up a new project using SENF' documentation

Utils: Add WrapException template
Utils/Daemon: BUGFIX: Only remove pidfile if we have created one ourselves

Socket: Fix NetDeviceController.test.cc (use 'lo' interface instead of 'wlan0'
Socket/Protocols/MPEGDVBbundle: Fix TransportPacket.test.cc (add 0 to constant to fix link error)

   - renamed "description()" member to "errorString()", 
   - renamed "where" attribute to "description", 
   - changed "what()" ouptut.

Changed all exceptions to inherit from senf::Exception
Replaced all throwErrno() calls with throw SystemException()

PPI: Allow access to source/sink helper in (Active|Passive)Socket(Source|Sink)

Replace all 'throw SystemException(...)' commands with 'throwErrno(...)'
Add additional links to documentation header

Utils: Implement ErrnoException

Unified emacs Local Variables

Renaned directory satscons to senfscons

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