Patch for candidate-dev-master-2017-08-17

- Fixes declaration of ref_pres in MOM_neutral_diffusion.F90 to
  avoid run-time OOB error reported by NCAR (@gustavo-marques).
  - NCAR are using the same version of Intel (16.0.3) that GFDL
    uses for testing but evidently have better compiler options
    that caught this - none of our tests failed.
- No answer changes.

src/tracer/MOM_neutral_diffusion.F90

@@ -360,7 +360,7 @@ subroutine neutral_diffusion_calc_coeffs(G, GV, h, T, S, EOS, CS)
   ! Variables used for reconstructions
   real, dimension(SZK_(G),2) :: ppoly_r_S            ! Reconstruction slopes
   integer :: iMethod
-  real, dimension(SZI_(G)+1) :: ref_pres ! Reference pressure used to calculate alpha/beta
+  real, dimension(SZI_(G)) :: ref_pres ! Reference pressure used to calculate alpha/beta
 
   ! If doing along isopycnal diffusion (as opposed to neutral diffusion, set the reference pressure)
   if (CS%ref_pres>=0.) ref_pres(:) = CS%ref_pres