I just committed a major refactor to Sequel's transaction support.  I
don't anticipate this breaking any backwards compatibility, but it
definitely needs extensive testing, especially on Oracle, Firebird,
and ODBC.  If you use one of these adapters and want to make sure it
still works in 3.1, please test it now and let me know whether or not
it works.

If you haven't been following the commits recently, here's whats been
going on:

* The bin/sequel tool got -d and -D options to dump a schema migration
for the database to the standard output.

* The bin/sequel tool got a -C option for copying one database to
another.  This is similar to Taps.  It's probably faster but less
robust.  Obviously it requires direct access to both databases from
the same machine.

* Database#create_table? and Model.create_table? were added, to
replace the create_table unless table_exists? construct.

* UNION, INTERSECT, and EXCEPT now operate much more intuitively when
dealing with ordered and/or limited datasets.

* The Sequel.extension method was added for loading extensions, so you
don't have to require them manually.

Jeremy
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