Handling of arrays with F2PY

Output arrays are returned and are not part of the argument list, as seen from Python
Need depend(nx,ny) a to specify that a is to be created with size nx, ny in the wrapper
Array dimensions are optional arguments (!) 
class Grid2Deff(Grid2D):
    ...
    def ext_gridloop2(self, f):
        a = ext_gridloop.gridloop2(self.xcoor, self.ycoor, f)
        return a
The modified interface is well documented in the doc strings generated by F2PY

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