Tszip

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- Add `tszip.load` which loads both compressed and uncompressed trees sequences
(benjeffery, 75)

- tszip now supports Python 3.10 and 3.11, 3.7 support has been removed.
(benjeffery, 76)

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- Support compressing to stdout (aabiddanda, 53, 64)

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- Fix for `time_units` in tskit 0.4.0 (benjeffery, 54, 55)

- Add support for reference sequence (benjeffery, 59)

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- Support decompressing to stdout. (aabiddanda, 44).

- Add support for new columns in tskit. (benjeffery, 39, 42).

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Initial version