- apply autopep8 + manual fixes to most of test/sql/

would produce an empty WHERE clause when an empty :func:`.and_()`
or :func:`.or_()` or other blank expression were applied.  This is
now consistent with that of :func:`.select`.
fixes #3045

- move out logging tests from test_execute to test_logging

in Py3.2.  Patch courtesy Arfrever Frehtes Taifersar Arahesis. fixes #2980

a no-name :class:`.BindParameter` is received, e.g. via :func:`.sql.literal`
or similar; the "key" of the bind param is used as the key within
.c. rather than the rendered name.  Since these binds have "anonymous"
names in any case, this allows individual bound parameters to
have their own name within a selectable if they are otherwise unlabeled.
fixes #2974

MySQL, to correctly render the SET clause among multiple columns
with the same name across tables.  This also changes the name used for
the bound parameter in the SET clause to "<tablename>_<colname>" for
the non-primary table only; as this parameter is typically specified
using the :class:`.Column` object directly this should not have an
impact on applications.   The fix takes effect for both
:meth:`.Table.update` as well as :meth:`.Query.update` in the ORM.
[ticket:2912]

table is a SELECT with its own bound parameters, where the positioning
of the bound parameters would be reversed versus the statement
itself when using MySQL's special syntax.
[ticket:2768]

- went through examples/ and cleaned out excess list() calls