Message 233865 - Python tracker

We still need a patch for max_length in BZ2Decompressor, and to use it in BZ2File. Also, I think my GzipFile patch should be considered as a bug fix (rather than enhancement), e.g. the fix for Issue 16043 assumes GzipFile.read(<size>) is limited.

I’m adding v4 of Nikolaus’s low-level LZMA patch. I merged v3 with the recent default branch and fixed the conflicts, since I couldn’t tell what revision it was originally based on. I also made some fixes based on my review comments.