[IMP] models: in _read_from_database(), fetch inherited fields when possible

This should improve the performance of method read() on models with inherited
fields, like product.product.  The inherited fields that are stored as columns
in parent tables (except for translated fields) are read in the same query as
the fields of the model.  Those fields will be directly stored in cache under
the main model, so that no copying will take place in cache for accessing them
(this is the default implementation of inherited fields).

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