Change _process_colparams method to remove duplicate isinstance calls
and try to speed up processing of the parameters.

Remove added dict comprehensions that make this patch set non python 2.6
compatible.

Instead of checking multiple times if parameters are a dictionary in the
form of a tuple or list of value pairs, we check it only once and then
store it in the statement so it can be used on compilation time.

Postpone as much as possible the change of update parameters to
OrderedDict from list or tuple of pairs.

This way we won't have problems with query's update method.

To avoid penalties for updates that do not require ordering, we will
only use OrderedDict for updates that receive a tuple or list of pairs,
and all kinds of dictionaries (dict, sqlalchemy's OrderedDict, or
collections.OrderedDict) will be treateated as unordered updates, just
like we were doing before.

This way this new feature will not change how updates behave for any
existing code and will only affect those that use the new ordered
feature.

This patch reverts update tests to how they were before as well as adds
a couple of tests to confirm that OrderedDicts are really treated like
normal dicts.

In some DBs the UPDATE operation is order dependent, so the operation
behaves differently depending on the order of the values.

As an example, imagine a volumes table with columns 'status' and
'previous_status' and we want to update a volume that has 'available' in
the status column.

If the SQL query is performed as:

 UPDATE volumes SET previous_status=status, status='new' WHERE id=1;

This will result in a volume with 'new' status and 'available'
previous_status both on SQLite and MariaDB, but if we reverse the
columns:

 UPDATE volumes SET status='new', previous_status=status WHERE id=1;

We will get the same result in SQLite but will result in a volume with
status and previous_status set to 'new' in MariaDB, which is not what we
want.

So order must be taken into consideration in some cases and it should be
allowed to ve specified via the Query update method or the values method
of an update.

This patch fixes this issue by preserving the order of parameters in
updates and allowing to receive not only dictionaries in update and
values but also ordered dictionaries and list/tuples of value pairs
(like dict and OrderedDict do).

fixes #3541

(cherry picked from commit 5db5e18d3babdb3ee857c075c774a585505b78ce)

(cherry picked from commit 81eefe038ea44a5314002483dde9cf00580df1bd)

(cherry picked from commit ea084bdc656a6a64db1ee582630d415bc8154505)

kinds of internal column loader options within internal logging.
fixes #3539