changes to parameters post api 13

[rgknox]

closing issue #616 as much of that was resolved.

We decided to update nutrient dynamics parameters at a later date, copying in comment by @jenniferholm:

@rgknox - The vcmax_np1, vcmax_np2, vcmax_np3, vcmax_np4 parameters are from Walker et al. 2014, and used in the ECA code, and vary by PFT.
Each one has the same descriptor of: "vcmax~np relationship coefficient") ==

Here are the values I found from an ELM parameter file, but I'm not sure if these are the up-to-date values. Here is the parameter file name: clm_params.c170414_defNUP_isvc_defmort_arctichvcmax_defNFIX_defPHTASE.nc

double vcmax_np1(pft) ;
vcmax_np1:long_name = "vcmaxnp relationship coefficient" ;
vcmax_np1:unit = "" ;
double vcmax_np2(pft) ;
vcmax_np2:long_name = "vcmaxnp relationship coefficient" ;
vcmax_np2:unit = "" ;
double vcmax_np3(pft) ;
vcmax_np3:long_name = "vcmaxnp relationship coefficient" ;
vcmax_np3:unit = "" ;
double vcmax_np4(pft) ;
vcmax_np4:long_name = "vcmaxnp relationship coefficient" ;
vcmax_np4:unit = "" ;

vcmax_np1 = 3.934375, 4.18625, 2.2828125, 4.8, 4.02421875, 3.878125, 4.8,
4.7175, 3.9421875, 3.7, 3.7859375, 3.73046875, 4.0046875, 3.7859375,
4.43859375, 3.7859375, 3.7390625, 3.7390625, 3.7390625, 3.7390625,
3.7390625, 3.7390625, 3.7390625, 3.7390625, 3.7390625 ;

vcmax_np2 = 0.65625, 0.7125, 0.853125, 0.7453125, 0.7640625, 0.9140625,
0.8015625, 0.91875, 1.096875, 0.6, 1.134375, 0.8390625, 0.646875,
1.134375, 0.6703125, 1.134375, 0.740625, 0.740625, 0.740625, 0.740625,
0.740625, 0.740625, 0.740625, 0.740625, 0.740625 ;

vcmax_np3 = 0.175, 0.09, 0.0775, 0.08625, 0.07125, 0.19125, 0.12125, 0.185,
0.1225, 0.04, 0.1725, 0.17125, 0.0825, 0.1725, 0.14625, 0.1725, 0.1675,
0.1675, 0.1675, 0.1675, 0.1675, 0.1675, 0.1675, 0.1675, 0.1675 ;

vcmax_np4 = 0.282, 0.282, 0.282, 0.282, 0.282, 0.282, 0.282, 0.282, 0.282,
0.282, 0.282, 0.282, 0.282, 0.282, 0.282, 0.282, 0.282, 0.282, 0.282,
0.282, 0.282, 0.282, 0.282, 0.282, 0.282 ;

[rgknox]

this is continuing via #799, closing