Fifth minor update to v0.60 (v0.65)

Two big modifications to the KPP algorithm:

1. Previously, enhanced diffusivity was only computed for MatchTechnique = 'MatchBoth'; now it is available for all MatchTechnique options by setting lenhanced_diff = .true. in cvmix_init_kpp

2. When using MatchTechnique = 'ParabolicNonlocal', gamma did not match the surface fluxes because the shape function (which = 1 at the surface) was still multiplied by the constant Cs. There is now an initialization setting lnonzero_surf_nonlocal which sets Cs = 1.

Also, a minor change in the stand-alone driver build system to make it easier to determine how to link to netCDF libraries.