See https://github.com/miniupnp/miniupnp/issues/119
- Replace the sameport parameter to the upnpDiscover* functions
- Added constants UPNP_LOCAL_PORT_ANY(0) & UPNP_LOCAL_PORT_SAME(1). The
value "1" was chosen for presumed backwards compatability with the
previous "sameport" parameter (assuming usesr would have set to 1 if
they wanted same port)
- Can be specified with "-z" to the test programs "upnpc" & "pymoduletest.py"