initial gitignore
netlink: move common t_ routines in common.py
generic: obsolete nlmsg_header() routine

Use nlmsg class instead of routine in the marshal
rtnl: get the typeString back
common: move hexdump to common.py
rtnl: support IPv6 ARP cache entries
netlink: debug mode

 * add header section only in debug mode
 * add timestamp to the header section
 * add hex msg dump to the header section
rtnl: separate marshalling modules

Place each message type in a separate module