Chapel function declarations must fully specify their type

[lydia-duncan]

Our recommended Chapel style is to allow the compiler to infer as much type information as possible rather than fully specifying the types. At the moment, however, Python-Chapel interoperation requires that the types for function arguments and return types are fully specified (as otherwise there would be a lot of generic versions to choose from). It would be nice if we can move away from this, so that any Chapel function can be used from Python.

This issue is of lower priority than the others currently listed (as of Dec 10, 2014).