zodbdump: Start to stabilize format + add test
We start to stabilize output format of `zodb dump`. It is actually now robust and the only thing I would contemplate to potentially change is to also cover transaction metadata by hash checksum. So please take a look at updated format (details in patch 1) to provide feedback because it is likely close to what it will be in its final form. We also add a program to generate test database which uses various fancy ZODB features and check `zodb dump` output on it to golden one (patch 3). To be able to dump transaction metadata in raw form ZODB is patched a bit: https://github.com/zopefoundation/ZODB/pull/183 and we try to detect whether appropriate support is there at runtime and if yes use it to streamline obtaining transaction extension as raw (patch 2). Pleae see patch 1 (second half of `zodbdump.py` about what has to be taken on without such support and that it still can't work fully reliably). /cc @nexedi /reviewed-on !3
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zodbtools/test/__init__.py
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zodbtools/test/test_dump.py
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zodbtools/test/test_util.py
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zodbtools/test/testdata/1.fs
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