Temporary OSPFv3 development commit
Cleanup in packet.c. Deleted unused parameters.
hello.* reindented, code cleanup.
hello.c and hello.h cleaned up. No design changes.
Added hellos on NBMA networks. (I don't violate RFC now.)
Destroying of neighbor moved from 'hello' to 'neighbor' andimproved.
ospf.c and ospc.h splitted into various files.