small cleanup of net

- remove an unneded else in ConnectNode()
- make 0 a double and change to 0.0 in ConnectNode()
- rename strDest to pszDest in OpenNetworkConnection()
- remove an unneded call to our REF() macro in BindListenPort()
- small style cleanups and removal of unneeded new-lines
convert an if into an else if in OpenNetworkConnection()
Merge pull request #4227

634bd61 convert an if into an else if in OpenNetworkConnection() (Philip Kaufmann)
5bd6c31 small cleanup of net (Philip Kaufmann)
remove SOCKS4 support from core and GUI

- now we support SOCKS5 only