Paramiko-ng

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* fix setup.py on osx (oops!)
* (bug 69330) check for the existence of RSA/DSA keys before trying to open
them in SFTPClient
* (bug 69222) catch EAGAIN in socket code to workaround a bug in recent
Linux 2.6 kernels
* (bug 70398) improve dict emulation in HostKeys objects
* try harder to make sure all worker threads are joined on Transport.close()

-----------------------
* fixed bug where HostKeys.__setitem__ wouldn't always do the right thing
* fixed bug in SFTPClient.chdir and SFTPAttributes.__str__ [patch from
mike barber]
* try harder not to raise EOFError from within SFTPClient
* fixed bug where a thread waiting in accept() could block forever if the
transport dies [patch from mike looijmans]

-------------------------
* added support for "old" group-exchange server mode, for compatibility
with the windows putty client
* fixed some more interactions with SFTP file readv() and prefetch()
* when saving the known_hosts file, preserve the original order [patch from
warren young]
* fix a couple of broken lines when exporting classes (bug 55946)

-------------------------
* more unit tests fixed for windows/cygwin (thanks to alexander belchenko)
* a couple of fixes related to exceptions leaking out of SFTPClient
* added ability to set items in HostKeys via __setitem__
* HostKeys now retains order and has a save() method
* added PKey.write_private_key and PKey.from_private_key

------------------------
* pageant support on Windows thanks to john arbash meinel and todd whiteman
* fixed unit tests to work under windows and cygwin (thanks to alexander
belchenko for debugging)
* various bugfixes/tweaks to SFTP file prefetch
* added SSHClient for a higher-level API
* SFTP readv() now yields results as it gets them
* several APIs changed to throw an exception instead of "False" on failure

----------------------------
* fixed HostKeys to more correctly emulate a python dict
* fixed a bug where file read buffering was too aggressive
* improved prefetching so that out-of-order reads still use the prefetch
buffer
* added experimental SFTPFile.readv() call
* more unit tests