sql_catalog: Drop usage of getattr from SQLCatalog
This would increase compatibility between accessors in erp5_catalog and remove the need of copy and patch. At the same time, it also helps in increasing performance as using _getOb is always less costly than getattr, as it reduces the need to look in acquisition. One of the difference between SQL and ERP5 Catalog is how they handle their properties. For ERP5Catalog, we use property_sheets which generate setters and getters, for SQLCatalog, properties just act as attributes(as one can expect from a property set on a class). This creates a difference on how we use them, especially for list_type properties, which have accessors like get<PropertyName>List to get the list of objects. For SQLCatalog, there is no such thing. This creates problem whereever 'get<PropertyName>' or getProperty(<name>) was being used to get multiple property types.
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