let's admit it's not 1992 any more. CIDR is around for a long time, even

that router vendor doesn't default to classful routing any more, and there
really is no point in having a classful netmask and a subnetmask to split
it. we still do classful guesses on the netmask if it isn't supplied by
userland, but that's about it.
i decided to keep ia_netmask and kill ia_subnetmask which makes this diff
bigish, the classful ia_netmask wasn't really used all that much. the real
changes are in in.c, the rest is mostly s/ia_subnetmask/ia_netmask.
ok claudio dlg ryan

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