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

* 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

Unified emacs Local Variables

Set fixed column width in member docs

Updated documentation templates to include cross-reference
Fixed documentation build (especially regarding cleanup)
Cleaned up BUG, FIXME, TODO and IDEA items
More SocketLibrary documentation

Renaned directory satscons to senfscons

Implemented EAGAIN / EWOULDBLOCK and EINTR handling
Made the generic connect implementation always block
Implemented SocketHandle::state() infrastructure

implemented rudimentary PacketSocketHandle testing

added listen to ConnectedCommunicationPolicy
added primitive doxygen documentation
cleaned up naming of some files
fixed INetProtocol.cc (missing const modifiers)
removed SocketProtcolHelper in favor of directly inheriting SocketProtocol virtually
moved implementation of TCPv4SocketProtocol virtual methods into the base classes
added rudimentary testing of the TCPv4SocketHandle protocol interface
finalized PacketSocketHandle

started ClientSocketHandle generic interface

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