Z3c.sqlalchemy

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- the SessionDataManager now supports ZODB savepoints

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- WARNING: this version requires SA 0.4.X and higher

- fixed import issues with the upcoming SA 0.4.X series

- create_session() calls (for SA 0.4.X)

- the unittests support an optional $TEST_DSN environment in order
to run the test against an existing database (other than SQLite)

- major overhoul of the Zope transaction integration: now using
one DataManager for the session object and the connection. The
connection as returned through the 'connection' property is also
used for creating a new 'session'. Older z3c.sqlalchemy version
used separate connections. This allows applications to use both
a session and a connection within the same Zope request/thread
without running into transaction problems. SQL actions and
session related modifications should happen within the same
transaction.

- Wrapper constructor now accepts two new optional dicts
'engine_options' and 'session_options' that will be passed down
to the engine and the sessionmaker. Patch provided by
Klaus Barthelmann.

- mapped objects now provide a method asDict() to return the values
of an objects as dict.

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- replaced BoundMetaData() with MetaData() (requires SA 0.3.9+)

- removed zope.* dependencies in order to avoid zope.* version
mismatches for now

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- using Zope 3.3.X as a fixed depenceny

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- added namespace declarations

- reST-ified documentation

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- SessionDataManager: create a session transaction as late
as possible and only if necessary in order to minimize deadlocks.
So z3c.sqlalchemy won't create a transaction any more if there
only SELECT operations within the current session.