Constructs a connection to a Gephi master server.
The connection object can be constructed either by specifying the url
directly, or by specifying the
The latter three are evaluated only if url is None; otherwise the
url will take precedence.
The url argument does not have to include the operation (e.g.,
?operation=updateGraph); the connection will take care of it.
E.g., if you wish to connect to workspace 2 in a local Gephi instance on
port 7341, the correct form to use for the url is as follows: