Spade

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* Fixed documentation.

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* Upgraded to SPADE>=3.3 (older versions are deprecated).
* Upgraded to Python>=3.8 (older versions are deprecated).

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* Allow to send messages to JIDs stored as beliefs.

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* Allow .send to a list of receivers.
* Allow to receive messages with lists of lists.
* Fixed readme.

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* Added requirements file.
* Fixed tox configuration for CI.
* Fixed readthedocs configuration.

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* Moved from pyson to python-agentspeak
* Added some helpers like pause_bdi, resume_bdi.
* Now the asl file in the constructor is mandatory.
* Allow to send tell messages with no args.
* Allow sending messages with variables.
* Extended the examples.