cubicweb-array #3036179 provide sqlite serialization functions [validation pending]

When FloatArray base type is used, sqlite crashes when it creates the test database because it's unable to serialize arrays.

To make array actually testable, it would probably require to modify logilab.database in order to be able to provide a SQL to Python deserializer, but the bare minimum would be not to crash when creating test database.

done in0.1.0
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closed by#008576e89dae provide sqlite serializer for arrays (closes #3036179)
patchprovide sqlite serializer for arrays (closes #3036179) [applied]