(*)Parenthesize MOM_hor_visc for FMAs

  Added parentheses to 40 expressions horizontal_viscosity and another 14
expressions in in hor_visc_init and 3 more in align_aniso_tensor_to_grid to give
rotationally consistent solutions when fused-multiply-adds are enabled.   Also
swapped the order of two terms in the expression for Del2u to mirror the order
of the corresponding terms in Del2v for rotational symmetry with FMAs.  All
answers are bitwise identical in cases without FMAs, but answers could change
when FMAs are enabled.