py: ordering of non database fields

Registered by Ferdinand on 2010-02-13

currently only db fields can be used limiting the use of
* function fields
* relation fields
** Example - it's not possible to sort products by name (from products_template)

see also
https://blueprints.launchpad.net/openobject-client/+spec/xml-specific-order
which may make this bp obsolete

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