Netfilterqueue

Add Packet accessors for {indev, outdev, physindev, physoutdev} interface indices

Propagate exceptions raised by the user's packet callback
Avoid calls to the packet callback during queue unbinding
Raise an error if a packet verdict is set after its parent queue is closed
set_payload() now affects the result of later get_payload()
Handle signals received when run() is blocked in recv()
Accept packets in COPY_META mode, only failing on an attempt to access the payload
Add a parameter NetfilterQueue(sockfd=N) that uses an already-opened Netlink socket
Add type hints
Remove the Packet.payload attribute; it was never safe (treated as a char* but not NUL-terminated) nor documented, but was exposed in the API (perhaps inadvertently).

Improve usability when Packet objects are retained past the callback
Add Packet.retain() to save the packet contents in such cases
Eliminate warnings during build on py3
Add CI and basic test suite
Raise a warning, not an error, if we don't get the bufsize we want
Don't allow bind() more than once on the same NetfilterQueue, since that would leak the old queue handle
** This will be the last version with support for Python 2.7. **

Fix bug 25- crashing when used in OUTPUT or POSTROUTING chains

Add get_hw()
Fix byte order bug in set_mark

Add Python 3 compatibility.
Add sock_len argument to bind()
Add block argument to run()
Add run_socket()
Fix COPY* constants
Don't crash on double unlink()