Fix Boost API compatibility and pre-existing bugs

Fix Boost API compatibility and pre-existing bugs

Main changes:
- src/ip/ipv6header.cpp: Remove BOOST_ASSERT with bytes_type::size()
- src/config/configurationoptions.cpp: Use boost::shared_ptr
- src/tcp/tcpheader.cpp: Remove BOOST_ASSERT with bytes_type::size()
- src/host/pingerfactory.cpp: Fix system_error header include path
- src/host/networkinterface.hpp: Socket.native() -> Socket.native_handle()
- src/icmp/icmppinger.cpp: Use boost::function
- src/tcp/tcppinger.cpp: Use boost::function
- lib/boost-net-dns/boost/net/network_array.hpp: Use .data() for bytes_type

Bug fixes in src/host/messagepayload.cpp:
- Fix out-of-bounds access in append() debug assertion
  (extra_data_end used invalid index instead of data() + size())
- operator= uses resize() to properly grow vector when needed