Draft Version of Tryton_Sphinx integration

I have made a draft version of the module to connect Tryton to Sphinx Search server.

This module currently gets all the objects from the Tryton.pool.Pool and make any field that was originally selected by the author to be indexed (an searchable) on the database also searchable on Sphinx Search, with the benefit of full-text indexing on char and text fields, while making other fields available as attributes.

I choose to implement this way in order to maintain compatibility with the current modules developed for Tryton 1.8, 2.0 and the future Tryton 2.2, in a manner that no module developer should make any additional effort in order to make their module compatible with the new search methodology if the Tryton.

I have pushed my code to a github repository, along with the basic instruction on how to download, install, create the sphinx configuration, index the Tryton Pool ojects and run a searchd daemon in order to listen to incoming search queries.

https://github.com/dfamorato/tryton_sphinx

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