Removed SharedHandle::isNull(). Instead we added operator* and
operator unspecified_bool_type. Removed use of WeakHandle and
replaced with raw pointer.
Return SharedHandle<LpdMessage>(new LpdMessage()) if received data
is bad in LpdMessageReceiver.
* src/LpdMessage.h
* src/LpdMessageReceiver.cc
* src/LpdMessageReceiver.h
* src/LpdReceiveMessageCommand.cc
* test/LpdMessageReceiverTest.cc
Added --bt-lpd-interface option to specify the interface to use
for Local Peer Discovery. LpdMessageDispatcher object now has its
own socket. LpdMessageReceiver's socket is binded to multicast
address to only receive multicast packets.
* src/BtSetup.cc
* src/LpdMessageDispatcher.cc
* src/LpdMessageDispatcher.h
* src/LpdMessageReceiver.cc
* src/LpdMessageReceiver.h
* src/LpdReceiveMessageCommand.cc
* src/LpdReceiveMessageCommand.h
* src/OptionHandlerFactory.cc
* src/SocketCore.cc
* src/SocketCore.h
* src/prefs.cc
* src/prefs.h
* src/usage_text.h
* test/LpdMessageDispatcherTest.cc
* test/LpdMessageReceiverTest.cc
