Paramiko-ng

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* a few performance enhancements
* added HostKeys, for dealing with openssh style "known_hosts" files, and
added support for hashed hostnames
* added Transport.atfork() for dealing with forked children
* added SFTPClient.truncate, SFTPFile.chmod, SFTPFile.chown, SFTPFile.utime,
and SFTPFile.truncate
* improved windows demos [patch from mike looijmans], added an sftp demo, and
moved demos to the demos/ folder
* fixed a few interoperability bugs
* cleaned up logging a bit
* fixed a bug where EOF on a Channel might not be detected by select [found
by thomas steinacher]
* fixed python 2.4-ism that crept in [patch by jan hudec]
* fixed a few reference loops that could have interacted badly with the python
garbage collector
* fixed a bunch of pychecker warnings, some of which were bugs

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* compression support (opt-in via Transport.use_compression)
* sftp files may be opened with mode flag 'x' for O_EXCL (exclusive-open)
behavior, which has no direct python equivalent
* added experimental util functions for parsing openssh config files
* fixed a few bugs (and potential deadlocks) with key renegotiation
* fixed a bug that caused SFTPFile.prefetch to occasionally lock up
* fixed an sftp bug which affected van dyke sftp servers
* fixed the behavior of select()ing on a closed channel, such that it will
always trigger as readable

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* SFTPFile.prefetch() added to dramatically speed up downloads (automatically
turned on in SFTPClient.get())
* fixed bug where garbage-collected Channels could trigger the Transport to
close the session (reported by gordon good)
* fixed a deadlock in rekeying (reported by wendell wood)
* fixed some windows bugs and SFTPAttributes.__str__() (reported by grzegorz
makarewicz)
* better sftp error reporting by adding fake "errno" info to IOErrors

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* added support for "keyboard-interactive" authentication
* added mode (on by default) where password authentication will try to
fallback to "keyboard-interactive" if it's supported
* added pipelining to SFTPFile.write and SFTPClient.put
* fixed bug with SFTPFile.close() not guarding against being called more
than once (thanks to Nathaniel Smith)
* fixed broken 'a' flag in SFTPClient.file() (thanks to Nathaniel Smith)
* fixed up epydocs to look nicer
* reorganized auth_transport into auth_handler, which seems to be a cleaner
separation
* demo scripts fixed to have a better chance of loading the host keys
correctly on windows/cygwin

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* added SSH-agent support (for posix) from john rochester
* added chdir() and getcwd() to SFTPClient, to emulate a "working directory"
* added get() and put() to SFTPClient, to emulate ftp whole-file transfers
* added check() to SFTPFile (a file hashing protocol extension)
* fixed Channels and SFTPFiles (among others) to auto-close when GC'd
* fixed Channel.fileno() for Windows, this time really
* don't log socket errors as "unknown exception"
* some misc. backward-compatible API improvements (like allowing
Transport.start_client() and start_server() to be called in a blocking way)

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* added SFTPClient.close()
* fixed up some outdated documentation
* made SFTPClient.file() an alias for open()
* added Transport.open_sftp_client() for convenience
* refactored packetizing out of Transport
* fixed bug (reported by alain s.) where connecting to a non-SSH host could
cause paramiko to freeze up
* fixed Channel.fileno() for Windows (again)
* some more unit tests