* The lists of columns/indices/joins are now sorted according to the order
* ``validator2`` was added to all columns; it is inserted at the beginning
of the list of validators, i.e. its ``from_python()`` method is called
first, ``to_python()`` is called last, after all validators in the list.
* SQLiteConnection's parameter ``use_table_info`` became boolean with default
value True; this means the default schema parser is now based on ``PRAGMA
* Major API change: attribute 'dirty' was moved to sqlmeta.