Added check for streaming responses when determing whether to add a content-length header and setting a 204 response. This should fix the problem of streaming response having content-length 0 respone headers. Thanks to Toby Dickenson.

Added a lock to tempfile producers. Thanks to Toby Dickenson. This should avoid possible corruption of responses from FCGI and large HTTP responses.

Major restructuring to fix a number of bugs:

  - Methods (retrieved as attributes) were sometimes not
    bound to objects in the right context. This could cause
    acquisition to fail within the methods.

  - An optimization skipped calling the __of__ method, assuming that
    it was skipping the standard acquistion __of__ method. This could
    cause application __of__ methods to get skipped. Now the __of__
    method is never skipped. The return value is inspected to
    see if it can be simplified. In the future we might be willing
    to skip calling __of__ if we *know* that we are skipping a known
    __of__.

  - The special value, Acquired, used to force acquisition
    was not handled correctly when it was acquired from a container.

  - Some error handling was not done quite correctly. I don't know
    if this caused any problems.

  - Nested explicit acquisition wrappers may not have been handled
    correctly when accessed through attribute access of a containing
    implicit wrapper.

Reduced code by sending all searches through the same routine,
Wrapper_findattr.

Added two new features:

  - You can now assign the aq_parent attribute of a wrapper.
    This is deemed to be useful in certain applications, including
    XML/DOM.

  - The method aq_acquire hysterically has two usages:

    o To explicitly acquire from an Explicit acquirer wrapper.

    o To apply a filter to guide the search process (e.g. for security).

    Sometimes, someone might want to apply a filter without forcing
    explict acquisition. An additional optional argument was added
    to allow use of a filter without forcing explicit acquisition.

Made 'record' class act like a mapping, primarily so that you can pass it to a propertysheet's change or edit methods.  It is also nice to be able to inspect a record's keys().

where the fixes have been released in 2.1.5

Fixed a bug in manage_clone thanks to Tom Scheidt. The cloned object was not being returned in its acquisition context. This caused permission problems when trying to perform operations on it.

Fixed problems which can occurr over a very fast link. This was fixed in 2.1.3 but didn't make it back into the regular branch.