gridloop1; more testing in the loop

We should check that allocations work fine: 
      arglist = Py_BuildValue("(dd)", *x_i, *y_j);
      if (arglist == NULL) {  /* out of memory */
         PyErr_Format(PyExc_MemoryError,
                      "out of memory for 2-tuple);
The C code becomes quite comprehensive; much more testing than ``active'' statements

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