Infi-clickhouse-orm

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- Bug fix: add field names list explicitly to Database.insert method (anci)
- Added RunPython and RunSQL migrations (M1hacka)
- Allow ISO-formatted datetime values (tsionyx)
- Show field name in error message when invalid value assigned (tsionyx)
- Bug fix: select query fails when query contains '$' symbol (M1hacka)
- Prevent problems with AlterTable migrations related to field order (M1hacka)
- Added documentation about custom fields.

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- Add `distinct` method to querysets
- Add `AlterTableWithBuffer` migration operation
- Support Merge engine (M1hacka)

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- Fix python3 compatibility (TvoroG)
- Nullable arrays not supported in latest ClickHouse version
- system.parts table no longer includes "replicated" column in latest ClickHouse version

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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