Versioned-hdf5

Major Changes

- String lengths are now included with variable-length string array hashes. This
solves an issue with hashing uniqueness with string arrays.

Minor Changes

- Fixed an error message directly passing a file name to VersionedHDF5File.
- Removed all posixpath "pp" aliases, to prevent conflict with prettyprint debug
command.
- Fix deprecated CI parameter.

Major Changes

- Fixed an issue with rebuilding hashtables; new `DATA_VERSION` released

Minor Changes

- Rewrote a test for improved maintainability

Minor Changes

- Fix to avoid writing to temporary dataset during `delete_versions`, reducing
the chance for out-of-memory errors.
- Fix to `_rebuild_hashtables` to allow for rebuilding hashtables of datasets
nested arbitrarily deeply inside groups.
- A sensible default chunk size is now guessed by default if none is specified
when creating 1D datasets.

Minor Changes

- Fix to prevent a quadratic runtime in `delete_versions`

Minor Changes

- Fix an issue where calling `delete_versions` on a dataset with a variable
length string dtype before using `h5repack` on it would corrupt the file

Major Changes

- Fix an issue where hashes of object dtypes were not being correctly computed
([257](https://github.com/deshaw/versioned-hdf5/pull/257)). This change
modifies how the hashes are computed for object dtypes.

Minor Changes

- Remove old rever-based version release system in favor of GitHub workflows.