Rebase to latest upstream release per NEWS file
    
    What's new in psycopg 2.8.1
    ---------------------------
    
    - Fixed `RealDictRow` modifiability (:ticket:`#886`).
    - Fixed "there's no async cursor" error polling a connection with no cursor
      (:ticket:`#887`).
    
    What's new in psycopg 2.8
    -------------------------
    
    New features:
    
    - Added `~psycopg2.errors` module. Every PostgreSQL error is converted into
      a specific exception class (:ticket:`#682`).
    - Added `~psycopg2.extensions.encrypt_password()` function (:ticket:`#576`).
    - Added `~psycopg2.extensions.BYTES` adapter to manage databases with mixed
      encodings on Python 3 (:ticket:`#835`).
    - Added `~psycopg2.extensions.Column.table_oid` and
      `~psycopg2.extensions.Column.table_column` attributes on `cursor.description`
      items (:ticket:`#661`).
    - Added `connection.info` object to retrieve various PostgreSQL connection
      information (:ticket:`#726`).
    - Added `~connection.get_native_connection()` to expose the raw ``PGconn``
      structure to C extensions via Capsule (:ticket:`#782`).
    - Added `~connection.pgconn_ptr` and `~cursor.pgresult_ptr` to expose raw
      C structures to Python and interact with libpq via ctypes (:ticket:`#782`).
    - `~psycopg2.sql.Identifier` can represent qualified names in SQL composition
      (:ticket:`#732`).
    - Added `!ReplicationCursor`.\ `~psycopg2.extras.ReplicationCursor.wal_end`
      attribute (:ticket:`#800`).
    - Added *fetch* parameter to `~psycopg2.extras.execute_values()` function
      (:ticket:`#813`).
    - `!str()` on `~psycopg2.extras.Range` produces a human-readable representation
      (:ticket:`#773`).
    - `~psycopg2.extras.DictCursor` and `~psycopg2.extras.RealDictCursor` rows
      maintain columns order (:ticket:`#177`).
    - Added `~psycopg2.extensions.Diagnostics.severity_nonlocalized` attribute on
      the `~psycopg2.extensions.Diagnostics` object (:ticket:`#783`).
    - More efficient `~psycopg2.extras.NamedTupleCursor` (:ticket:`#838`).
    
    Bug fixes:
    
    - Fixed connections occasionally broken by the unrelated use of the
      multiprocessing module (:ticket:`#829`).
    - Fixed async communication blocking if results are returned in different
      chunks, e.g. with notices interspersed to the results (:ticket:`#856`).
    - Fixed adaptation of numeric subclasses such as `~enum.IntEnum`
      (:ticket:`#591`).
    
    Other changes:
    
    - Dropped support for Python 2.6, 3.2, 3.3.
    - Dropped `psycopg1` module.
    - Dropped deprecated `!register_tstz_w_secs()` (was previously a no-op).
    - Dropped deprecated `!PersistentConnectionPool`. This pool class was mostly
      designed to interact with Zope. Use `!ZPsycopgDA.pool` instead.
    - Binary packages no longer installed by default. The 'psycopg2-binary'
      package must be used explicitly.
    - Dropped `!PSYCOPG_DISPLAY_SIZE` build parameter.
    - Dropped support for mxDateTime as the default date and time adapter.
      mxDatetime support continues to be available as an alternative to Python's
      builtin datetime.
    - No longer use 2to3 during installation for Python 2 & 3 compatibility. All
      source files are now compatible with Python 2 & 3 as is.
    - The `!psycopg2.test` package is no longer installed by ``python setup.py
      install``.
    - Wheel package compiled against OpenSSL 1.0.2r and PostgreSQL 11.2 libpq.