- moved command functions to separate command.c file
- added FILE record, replay and boolean int virtual to replay_interface
- added functions find_prefix, find_oiface, find_interface_by_name
- added function new_viface to create a new virtual replay_interface
with given name
- added function iface_up which brings a replay_interface up as an
ospf_interface if the interface prefix is a valid ospf_prefix
- added function ip_in_net to return boolean if given ip is within a
provided network and mask
- config file now supports 'interface [x]' blocks where x is interface
name
- config file now supports 'replay [filename]', 'record [filename]', and
'ip [ip_address]' commands within an interface block
- ip interface command ignored if interface is not virtual