Also update the i/o test with the new function signature.

tests/testReading.c

@@ -45,7 +45,7 @@ int main() {
 
   /* Read data */
   read_ic_single("input.hdf5", &us, dim, &parts, &gparts, &sparts, &Ngas,
-                 &Ngpart, &Nspart, &periodic, &flag_entropy_ICs, 1, 1, 0, 0);
+                 &Ngpart, &Nspart, &periodic, &flag_entropy_ICs, 1, 1, 0, 1, 0);
 
   /* Check global properties read are correct */
   assert(dim[0] == boxSize);