Message 177134 - Python tracker

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TreeBuilder was also pickleable in 3.2 but now isn't so; updating summary accordingly.

Attaching a checkpoint patch.  It addresses both Element and TreeBuilder, and adds tests.  The added tests fail if test___all__ is included in the test run, so the patch should not be applied as-is.

Thanks to Ezio Melotti for preliminary review and suggestions on IRC.