Add necessary code for obtaining IPv4 addresses on network interfaces
Try to bind local sockets to specified local address

For login and logout operations, the specified interface
shall be used not only for MAC address retrieval, but also for all
communications.  We try to do this by binding the local sockets
to the corresponding IP address.
Merge branch 'really-use-network-interface-for-all-communications'

Conflicts:
	pysrun
Update doc and sync version tag for 1.0.8