allow signature return type annotations to provide a more specific return object type for def functions

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extra : amend_source : fe959a1a34b1e190fbe051c7058fcf51c50a2fa8

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extra : amend_source : 49ba7a5625c69a46f550f471dfbd462a5082b27c

speed up cythonized hexiom2 benchmark a little by using C int arrays instead of fixed size Python lists

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extra : amend_source : c0a1e78dbfd443585a80bd646b763617eeb6b7c5

allow list literals with a constant multiplier to be assigned to C arrays, extend array assignment tests

This seems to have been a mis-understanding on how C++ works/is wrapped.

prevent recursively generated Cython utility code (i.e. used by other Cython utility code) from appearing multiple times in the output due to a different outer module scope