Reflection of unique constraints must preserve the order of columns.

If SQLite keywords are used as column names, they are
quoted. The code parsing the information about table
unique constraints should be modified so that it properly
removes double-quotes from column names.

Call eq_() in a loop instead of comparing two lists
directly. This makes it much easier to find out which
element is not equal to the reference value.

called :attr:`.TypeDecorator.coerce_to_is_types`,
to make it easier to control how comparisons using
``==`` or ``!=`` to ``None`` and boolean types goes
about producing an ``IS`` expression, or a plain
equality expression with a bound parameter.
[ticket:2744]

- some whitespace

cannot find meaning of this anywhere in Postgresql documentation) seems to work

Support for Postgres range types.

Forgot final check that a delete in a backref also doesn't create a new version