With this change, example vweb programs, will continue to be available to both
ipv6 and ipv4 connections from the same machine, even after doing (on linux):
`echo 1 | sudo tee /proc/sys/net/ipv6/bindv6only`
Previously, after that, vweb programs responded only to ipv6 connections, but not to ipv4 ones,
i.e. opening http://127.0.0.1:8082/ stopped working, for `v run examples/vweb/vweb_example.v` .
Note: GO web servers have the same behaviour, which is convenient for development/testing,
since it makes the programs more consistent and robust in the face of OS settings changes.
net provides networking functions. It is mostly a wrapper to BSD sockets,
so you can listen on a port, connect to remote TCP/UDP services, and
communicate with them.