Subnets are represented in the routing table as a set of
binary routing nets using the standard netmask algorythm.
The code produces the minimum possible set of standard netmasks and
net addresses to be able to represent a given netrange.
Kernel Appletalk protocol support
both CAP and netatalk can make use of this..
still needs some owrk but it seemd the right tiime to commit it
so other can experiment.
