Updated package to latest version, 3.6.6. Changes include:

* Netplex_container: emits now backtraces if these are enabled.
* Http_fs: adding [last_response_status] method
* Rpc_client: fixing a potential endless loop when session IDs
  are reused
* Rpc_client: fixing the shutdown when a TCP connection is
  immediately refused, and GSS-API authentication is active.
* Netcgi_fcgi.run: no longer ignoring the sockaddr argument
  (problem reported by Watanabe Masaki)
* Remove duplicate method Netpop.stat

(jaapb)