Z3c.sqlalchemy

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- support for sqlalchemy.ext.declarative

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- now using zope.sqlalchemy for ZODB transaction integration

- internal class renaming

- removed PythonBaseWrapper. Now there is only *one* ZopeWrappe class.

- requires SQLAlchemy 0.4.6 or higher

- requires zope.sqlalchemy 0.1 or higher

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- better error handling in case of a rollback (patch by Dieter Maurer)

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- reorganized .txt files

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- another savepoint fix

- fixed regression error introduced by previous change: commit the
zope transaction when ready in tpc_finish [maurits]

- fixed issue where session's transaction.nested was being called as
a callable (it should be straight attribute access) [Rocky]

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- fixed ZODB savepoint implementation. Now returning a proper dummy
savepoint