mysql_innodb_catalog: new subject_set scriptable key

Allows searching the catalog for documents having an exact set of
subjects, not just one subject.
In other words, `portal_catalog(subject=["a", "b"])` finds documents
with subject a or subject b and `portal_catalog(subject_set=["a, "b"])`
finds documents with subject a and subject b.
Status Job ID Name Coverage
  External
failed ERP5.CodingStyleTest-TestRunner2

01:33:58

failed ERP5.UnitTest-TestRunner2

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failed ERP5.UnitTest-Zope2-ForTestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.CodingStyleTest-TestRunner2

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failed ERP5.UnitTest-TestRunner2

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failed ERP5.UnitTest-TestRunner2

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failed ERP5.UnitTest-TestRunner2

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failed ERP5.UnitTest-TestRunner2

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failed ERP5.UnitTest-Zope2-ForTestRunner2

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failed ERP5.UnitTest-Zope2-ForTestRunner2

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failed ERP5.UnitTest-Zope2-ForTestRunner2

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failed ERP5.UnitTest-Zope2-ForTestRunner2

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failed ERP5.UnitTest-Zope2-ForTestRunner2

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