Update to Provider Independent addressing format drafts

["Tony Hain" <alh-ietf@tndh.net>]

The updates to the provider independent address format & usage drafts
are available at:
http://www.tndh.net/~tony/ietf/draft-hain-ipv6-pi-addr-fmt-01.txt
http://www.tndh.net/~tony/ietf/draft-hain-ipv6-pi-addr-use-01.txt

The usage document has been significantly reworked to address both
direct comments, as well as distillation of key issues from various mail
threads on nanog & multi6 lists. At this point comments should be
directed to the multi6 list.

Tony