Initial setup: created setup.py.
Sphinx is set up.
Extension build is set up.
Created basic function bodies for CMSG_LEN, ..., sendmsg, recvmsg.
Step forward: Extract fileno from socket.
Sending via iovecs/scatter gather implemented (sans freeing memory).
Created .gitignore to ignore generated files.
Freeing memory after sendmsg invocation implemented.
sendmsg seems to be able to send SCM_RIGHTS control messages.

Missing: recvmsg. And especially the code for converting a
socket address to a python object.
recvmsg can at least be used to receive plain data now.
Can send file descriptors (yay!)
Created tox setup.
Sending multiple ancillary data blocks works now.
Merge MIT license from github repository wizard.