[CWEP002] introduce RQLRelationRewriter Refactor existing RQLRewriter for later reuse of rewriting relation as specified by CWEP002. Work is different because we simply want to replace a relation by another rql snippet and we don't have to bother with EXISTS, subqueries and all. This rewriter is not yet plugged into the querier. Depends on yams 0.40 API. Related to #3546717

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Schema of the data

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First take a look at the data schema_ then try to remember that you are browsing

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through a heap of data by applying stylesheets to the results of queries. This

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site is not a content management system with items placed in folders. It is an

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interface to a database which applies a view to retreived data.

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.. _schema: schema