network_sweep - sweeps the network to ensure that deterministic constants are
  removed
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   network_sweep [-h][-v]

   This function performs a sweep on the given Ntk_Network_t. It propagates all
   the deterministic constant nodes, and removes all buffer nodes. It modifies
   the network. Command options:

   -h
          Print the command usage.

   -v
          Print debug information.
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   Last updated on 20100410 00h02