The old code used itertools.chain(), which didn't work as expected.
If the first of the two iterator grew after the chain had started
consuming the second iterator, the new element(s) in the first
iterator would never be consumed.

Fix this bug by eliminating the need for chaining.  Process all the
_added_during_commit objects at the end, each with its own
ObjectWriter instance.

Add explanation for __getattr__ and friends.

raised when an operation on a Connection can't be performed because the
Connection is in "a wrong state".

Connection.close() now raises this exception if the connection is
currently joined to a transaction (most obviously, if the transaction
the connection is joined to has modified objects waiting for commit
or abort).

Also changed other appropriate instances of RuntimeError to raise
ConnectionStateError instead (e.g., trying to load an object from a
closed connection).

Replace use of type('') with basestring.

The code didn't call setLocalTransaction(), so getTransaction() always
did the same thing as transaction.get().

essentially means a connection keep track of which objects from
the connection are modified, instead of transactions keeping track of that.
A good consequence hasn't yet been implemented:  if a connection is
closed with modifications still pending, we can detect that efficiently
now, and complain.

again

Add comment about use (or lack thereof) of classFactory in Zope.

application; needs work, but this should get most projects going

- add discussion of the issues surrounding keys and multikeys with
  name="+" and default values

the deprecation warning for setLocalTransaction().

This changes the behavior slightly for invalidations.  A Connection
will receive invalidations even if it didn't have any modified objects
in the transaction, e.g. db.undo() or a read-only transaction.  For
this to work, it assumes that the thread that called db.open() is the
thread that is going to use the connection.  If this isn't true, the
synch argument to db.open() can be used to disable the new feature.

note the different default hostname for an inet-address on Windows and Unix

ZServer package.

aren't needed any more