Paramiko-ng

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* fixed a bug where packets larger than about 12KB would cause the session
to die on all platforms except osx
* added a potential workaround for windows to let Channel.fileno() (and
therefore the select module) work!
* changed API for subsystem handlers (sorry!) to pass more info and make it
easier to write a functional SFTP server

-----------------------
* added SFTPClient.listdir_attr() for fetching a list of files and their
attributes in one call
* added Channel.recv_exit_status() and Channel.send_exit_status() for
manipulating the exit status of a command from either client or server
mode
* moved check_global_request into ServerInterface, where it should've been
all along (oops)
* SFTPHandle's default implementations are fleshed out more
* made logging a bit more consistent, and started logging thread ids
* fixed a few race conditions, one of which would sometimes cause a Transport
to fail to start on slow machines
* more unit tests

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* server-side SFTP support
* added support for stderr streams on client & server channels
* added a new distinct exception for failed client authentication
when caused by the server rejecting that *type* of auth
* added support for multi-part authentication
* fixed bug where get_username() wasn't working in server mode

---------------------------
* fixed bug that broke server-mode authentication by private key
* fixed bug where closing a Channel could end up killing the entire
Transport
* actually include demo_windows.py this time (oops!)
* fixed recently-introduced bug in group-exchange key negotiation that
would generate the wrong hash (and therefore fail the initial handshake)
* server-mode subsystem handler is a bit more flexible

-----------------------
* Transport.send_ignore() -- send random ignored bytes
* RSAKey/DSSKey added from_private_key_file() as a factory constructor;
write_private_key_file() & generate() to create and save ssh2 keys;
get_base64() to retrieve the exported public key
* Transport added global_request() [client] and check_global_request()
[server]
* Transport.get_remote_server_key() now returns a PKey object instead of a
tuple of strings
* Transport.get_username() -- return the username you auth'd as [client]
* Transport.set_keepalive() -- makes paramiko send periodic junk packets
to the remote host, to keep the session active
* python 2.2 support (thanks to Roger Binns)
* misc. bug fixes