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Avoid warnings in the generated code
Merge pull request #21 from ocsigen/unused-identifiers

Avoid warnings in the generated code
Add the type for string arrays
Add the array_agg aggregator
Provide a polymorphic type to array_agg
Fix the internal type of array_agg and add a generic TArray type
Add all the other types of array handled by PGOCaml
Fix the name returned for arrays
Arrays are in fact nullable. The representation has changed in PGOCaml in e2d0b1c (pgocaml commit hash)
Fix array_t to follow the previous commit
Switch from arrays to lists (following PGOCaml changes)
Merge branches 'oasis', 'agg', 'ordering' and 'in'