* Add more compact archive serialization option.
* Add option to select archive serializer (\27).
* Add option to commit dataset snapshot from a data stream.
* Add `histore.archive.reader.SnapshotReader` (a `histore.document.base.Document` implementation) to read dataset snapshots.
* Add close method to `histore.archive.reader.ArchiveReader` interface.
* Change behavior of `histore.document.schema.to_schema()` to take existing Column objects into account.
* Direct update of archive snapshots via `apply()` and `histore.document.operator.DatasetOperator`.
* Require archives to be created from initial snapshot if primary key is used.
* Add `histore.document.json.base.JsonDocument` to read serialized Json documents.
* Use user's cache directory as the default parent directory for archive managers.
* Remove option for partial merge.
* Rename type-hint ``Schema`` to ``DocumentSchema``.
* Add empty document class ``histore.document.mem.Schema``.
* Change format of serialized archive JSON files.
* Change internal representation of timestamps.