Tri-table

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* Made more parts of `BoundCell` available for reuse.

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* Added pass-through of extra arguments to `Link` objects for custom attributes.

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* Fix missing namespace collection for column custimization of Table.from_model

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* Renamed `db_compat.register_field_factory` to the clearer `register_column_factory`

* Improved error reporting on missing django field type column factory declaration.

* Added iteration interface to table to loop over bound rows

* Added `endpoint` meta class parameter to table to enable custom json endpoints

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* Support for ajax backend

* Dependent tri.form and tri.query libraries have new major versions

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* Minor bugfix for fields-from-model handling of auto fields