orig: sync with current
expect: fix typo and arg lack
test: add more
doc: embed C prototype in __doc__
mnl: follow the cpylmnl

put_new_header moved in Header class
conntrack: remove ctypes.create_string_buffer()

it does not be needed.
module name: indicate internal use

http://stackoverflow.com/questions/3602110/python-private-module-in-a-package
doc: change indentation

prepare for documentation