fibnum3

ok so i've learned a lot by trying to get fibnum2 upstreamed. needed ipv6, 
needed to be more minimalistic about unrelated changes, needed to keep in 
synch with the freebsd-current tree -- the works. i also scrambled my git tree 
somehow in a way that i found unrecoverable, thus i ended up closing that PR 
after fixing everything i learned about other than man page changes.

before i try again i'd like to go back to where it all started -- this e-mail 
list. visual review would be great, testing would be even better. for those 
who didn't keep state from last time, the intent is to let every interface 
have its own default route, and ensure inbound/outbound path symmetry. i use 
different interfaces for serving http-et-al than for doing ssh for operations/
management, and i've never been comfortable with a single default route.

diff is attached. "patch -p1" is your friend.

-- 
Paul Vixie