Resolve "Set combination are not semantically correct"

Closes #46 (closed)

added 6 commits

• a5818fed - fix arity in union of example
• 0c4f235d - SetCombination: all accepts None, left/right instead of subrelations
• f9898a35 - test SetCombination
• d37dbf34 - test sqlite (no DISTINCT, no INTERSECT/EXCEPT ALL) SetCombination
• f1f25535 - standard scoping in composed set combinations
• aae836d2 - sqlite fallback for composed set combinations

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added 1 commit

• 8cf840fd - sqlite: move ScopedDQL to qb.drivers.sqlite.specifics.py

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• e28367fc - added tests

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• 45515b8f - renamed test_specifics to test_sqlite_specifics

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• 40959706 - restored black badge in README

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merged

mentioned in commit fde992ba