generic: add the default value to get_attr()
generic: cdata binary NLA type
generic: new attrs and messages for NG transport
netlink: completely new NL core

many tests are still disabled

plugins are dropped
generic: make decoded msg suitable for encoding
netlink: network transport

Plain unencrypted tcp, masquerade debugging
netlink: compatibility with old serve() interface
netlink: add default address for unix sockets
netlink: rewind envelope buffer before encoding
netlink: fix typo
netlink: silently drop routing errors (2B fixed)
netlink: drop responses w/o IPR_ATTR_CDATA (2B fixed)
netlink: proper use of the message type

custom Netlink message type: NLMSG_TRANSPORT
tests: bring back unencrypted remote tests
netlink: correct message type constants
docs: messaging draft, beginning
netlink: incapsulate control messages too
netlink: u32 filter for I/O core

+ subscribe
netlink: fix mirroring
ipdb: fix default url