hello.c and hello.h cleaned up. No design changes.
Doc in neighbor.c and some tiny changes related to.
Cisco-like "show ospf neighbors" implemented.
Downing of interface should work.
Destroying of neighbor moved from 'hello' to 'neighbor' andimproved.
Sync with nest's rt table and some minor improvements.
Minor change in area list. Now I use MJ's lists.
ospf.c and ospc.h splitted into various files.