Fix python imports in SConscripts

Remove and/or simplify most remaining SENFSCons stuff

PPI: Allow IOEvents to be constructed with an in-valid() handle
Socket/Protocols/INet: Implement INet6Address::from_mac()
Socket/Protocols/Raw: Implement LLSocketAddress output streaming

added more tests to increase test coverage

Utils/Console: Move telnet functionality to Utils/Termlib
Utils/Termlib: Implement terminfo readier
Utils/Termlib: Implement terminfo based keycode parser

Clean up all file-defines and remove all tabs

Fix lot's of inline implementation ordering errors (make sure, all inline functions are implemented before first use)

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

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)

Packets/DefaultBundle/extra_tests: use unittest include from utils /grrr
Socket/Protocols/AddressExceptions: fixes
Socket: fixed documentation

Socket/Protocols: Move incorrectly placed members from AddressableBSDSocketProtocol to BSDSocketProtocol
Socket/Protocols: Add missing DatagramSocketProtocol to some protocols
Socket/Protocols: Extend documentation of addressing classes

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