v4.1

New features/additions:

• Implement IPv6::recv_response

• Add parsing of well known IPv6 extension headers (#287)

• Add missing operators to address classes (#275)

Fixes

• Fix serialization for QinQ (#316)

• Added base class access specifier for socket_close_error (#306)

• Rewrote hw_address_to_string to not require a stringstream (#299)

• Make RadioTapParser::skip_to_field check for end of buffer (#296)

• Ensure local include directory comes before system. (#293)

• Calculate IP option sizes properly (#288)

• Add version macros in config.h

• Don't assume IPv6 uses ICMPv6 underneath

• Allow users to specify library install dir

• Use Sleep windows function passing milliseconds as parameter

• Don't use nullptr in non C++11 code

• Ignore (possibly malformed) options after EOL (#281)

• Don't include dot11.h in tins.h if it is not configured in the library (#277)

• Fix memory leak in PDU's move assignment operator

• Append padding to IPv6 options