- added interface.c and removed all the references to myip, bcast_ip

- added interface.c and removed all the references to myip, bcast_ip
and Netmask, instead replacing them with calls to routines in
interface.c

- got rid of old MAXINT define

- added code to ensure we only return one entry for each name in the ipc
enum routines

- added new_only option to add_netbios_entry() to prevent overwriting
of important names

- minor time handling fixup