Includes:

PassiveDefault
SchemaItem.quote
Table.useexisting
Table.quote_schema
Table.append_ddl_listener
MetaData.append_ddl_listener
Metadata.reflect kw parameter (use reflect() method)
DDL.execute_at
DDL.on

Partially-fixes: #4643
Closes: #4893
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/4893
Pull-request-sha: 860eb6a253fe4a95685b4f5f3349b19823a304f3

Change-Id: I0f5b8a873e7581365ff8dba48eab358d9e8e7b13

Fixes: #4850

<!-- Provide a general summary of your proposed changes in the Title field above -->

### Description
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Removes usage of `util.callable`.

### Checklist
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This pull request is:

- [ ] A documentation / typographical error fix
	- Good to go, no issue or tests are needed
- [x] A short code fix
	- please include the issue number, and create an issue if none exists, which
	  must include a complete example of the issue.  one line code fixes without an
	  issue and demonstration will not be accepted.
	- Please include: `Fixes: #<issue number>` in the commit message
	- please include tests.   one line code fixes without tests will not be accepted.
- [ ] A new feature implementation
	- please include the issue number, and create an issue if none exists, which must
	  include a complete example of how the feature would look.
	- Please include: `Fixes: #<issue number>` in the commit message
	- please include tests.

**Have a nice day!**

Closes: #4851
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/4851
Pull-request-sha: a0ccdff2cb74f5e944d8baccc269c382b591c8e2

Change-Id: I79918f44becbc5dbefdc7ff65128695c1cabed1d

The :meth:`.Index.create` and :meth:`.Index.drop` methods now have a
parameter :paramref:`.Index.create.checkfirst`, in the same way as that of
:class:`.Table` and :class:`.Sequence`, which when enabled will cause the
operation to detect if the index exists (or not) before performing a create
or drop operation.

Fixes: #527
Change-Id: Idf994bc016359d0ae86cc64ccb20378115cb66d6

A major refactoring of all the functions handle all detection of
Core argument types as well as perform coercions into a new class hierarchy
based on "roles", each of which identify a syntactical location within a
SQL statement.  In contrast to the ClauseElement hierarchy that identifies
"what" each object is syntactically, the SQLRole hierarchy identifies
the "where does it go" of each object syntactically.   From this we define
a consistent type checking and coercion system that establishes well
defined behviors.

This is a breakout of the patch that is reorganizing select()
constructs to no longer be in the FromClause hierarchy.

Also includes a rename of as_scalar() into scalar_subquery(); deprecates
automatic coercion to scalar_subquery().

Partially-fixes: #4617
Change-Id: I26f1e78898693c6b99ef7ea2f4e7dfd0e8e1a1bd

This affects mostly docstrings, except in orm/events.py::dispose_collection()
where one parameter gets renamed: given that the method is
empty, it seemed reasonable to me to fix that too.

Closes: #4440
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/4440
Pull-request-sha: 779ed75acb6142e1f1daac467b5b14134529bb4b

Change-Id: Ic0553fe97853054b09c2453af76d96363de6eb0e

A large change throughout the library has ensured that all objects, parameters,
and behaviors which have been noted as deprecated or legacy now emit
``DeprecationWarning`` warnings when invoked.   As the Python 3 interpreter now
defaults to displaying deprecation warnings, as well as that modern test suites
based on tools like tox and pytest tend to display deprecation warnings,
this change should make it easier to note what API features are obsolete.

See the notes added to the changelog and migration notes for further
details.

Fixes: #4393
Change-Id: If0ea11a1fc24f9a8029352eeadfc49a7a54c0a1b

- fix a few "seealso"s
- ComparableProprerty's "superseded in 0.7" becomes deprecated in 0.7

Backport to currently maintained doc versions 1.2, 1.1

Change-Id: Ib1fcb2df8673dbe5c4ffc47f3896a60d1dfcb4b2

These changes should be ported from 1.3 back to 1.0 or
possibly 0.9 to the extent they are relevant in each
version. In 1.3 we hope to turn all deprecation documentation
into warnings.

Change-Id: I205186cde161af9389af513a425c62ce90dd54d8

Change-Id: I6a71f4924d046cf306961c58dffccf21e9c03911