484: make IPCP put all options in increasing numeric order in all cases.

Also fixed unrelated problem found during testing: the reqci handling
for the deprecated IP-Addresses option was setting go->ouraddr rather
than wo->ouraddr.  This caused us to get confused about the meaning of
any subsequent Configure-{Ack,Reject} from the peer, since it made it
look as though the option was illegally modified by the peer.