[ZODB-Dev] transaction exception-related reference leaks

[Chris McDonough]

I noticed some weird behavior with exceptions and transactions recently
(in particular, a WSGI server which relies on a __del__ to close its
client connection wasn't disconnecting from the client immediately when
a conflict error was raised by ZODB, but would indeed disconnect if a
conflict error had not been raised).

I tracked this down to the zope transaction module leaking frame stacks
via retrieving traceback objects from sys.exc_info() without
subsequently removing them from local scope.

With the attached patch, the issue was solved.  If no one complains,
I'll apply it to the transaction trunk.


- C


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