Pyrad

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* Fix typo in server class which broke handling of accounting packets.

* Create seperate AuthPacket and AcctPacket classes; this resulted in
a fair number of API changes.

* Packets now know how to create and verify replies.

* Client now directs authentication and accounting packets to the
correct port on the server.

* Add twisted support via the new curved module.

* Fix incorrect exception handling in client code.

* Update example server to handle accounting packets.

* Add example for sending account packets.

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* Fix last case of bogus exception usage.

* Move RADIUS code constants to packet module.

* Add support for decoding passwords and generating reply packets to Packet
class.

* Add basic RADIUS server and proxy implementation.

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* client.Timeout is now derived from Exception.

* Docstring documentation added.

* Include example dictionaries and authentication script.

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* Use proper exceptions.

* Encode and decode vendor attributes.

* Dictionary can parse vendor dictionaries.

* Dictionary can handle attribute values.

* Enhance most constructors; they now take extra optional parameters
with initialisation info.

* No longer use obsolete python interfaces like whrandom.

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* First release