ADDED:
* num-nets subcommand' this is MUCH much faster than actually splitting
if you're trying to figure out how many times a given subnet fits into
a network.
ADDED:
* The -s/--size argument to the VLSM splitter may now be a
comma-delimited list of sizes instead of needing to specify -s/--size
for each size.
This change is backwards-compatible.
