Infi.clickhouse-orm

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- Fix pagination for models with alias columns

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- Add `QuerySet.model` to support django-rest-framework 3

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- Improve support of ClickHouse v21.9 (mangototango)
- Ignore non-numeric parts in ClickHouse version (mangototango)
- Fix precedence of ~ operator in Q objects (mangototango)
- Support for adding a column to the beginning of a table (meanmail)
- Add stddevPop and stddevSamp functions (k.peskov)

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- Support for model constraints
- Support for data skipping indexes
- Support for mutations: `QuerySet.update` and `QuerySet.delete`
- Added functions for working with external dictionaries
- Support FINAL for `ReplacingMergeTree` (chripede)
- Added `DateTime64Field` (NiyazNz)
- Make `DateTimeField` and `DateTime64Field` timezone-aware (NiyazNz)

**Backwards incompatible changes**

Previously, `DateTimeField` always converted its value from the database timezone to UTC. This is no longer the case: the field's value now preserves the timezone it was defined with, or if not specified - the database's global timezone. This change has no effect if your database timezone is set to UTC.

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- Remove unnecessary import of `six`

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- Dropped support for Python 2.x
- New flexible syntax for database expressions and functions
- Expressions as default values for model fields
- Support for IPv4 and IPv6 fields
- Automatic generation of models by inspecting existing tables
- Convenient ways to import ORM classes

See [What's new in version 2](docs/whats_new_in_version_2.md) for details.