Infi.clickhouse-orm

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- Added `QuerySet.paginate()`
- Support for basic aggregation in querysets

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- Migrations: when creating a table for a `BufferModel`, create the underlying table too if necessary

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- Changed license from PSF to BSD
- Nullable fields support (yamiou)
- Support for queryset slicing

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- Added `ne` and `not_in` queryset operators
- Querysets no longer have a default order unless `order_by` is called
- Added `autocreate` flag to database initializer
- Fix some Python 2/3 incompatibilities (TvoroG, tsionyx)
- To work around a JOIN bug in ClickHouse, `$table` now inserts only the table name,
and the database name is sent in the query params instead

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- Major new feature: building model queries using QuerySets
- Refactor and expand the documentation
- Add support for FixedString fields
- Add support for more engine types: TinyLog, Log, Memory
- Bug fix: Do not send readonly=1 when connection is already in readonly mode

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- Fix broken Python 3 support (M1hacka)