CaCO3 burial improvement needs to be added to CISO

[mnlevy1981]

Keith added some new features that made it to the POP trunk (pre-MARBL) in November of 2015: part of the cesm_pop_2_1_20151117 trunk tag. This incudes

introduce caco3_bury_thres_opt, default=omega_calc

Part of this commit is a block of code that is now in marbl_mod

          if (zw(k) < caco3_bury_thres_depth) then
             P_CaCO3%sed_loss(k) = P_CaCO3%sflux_out(k) + P_CaCO3%hflux_out(k)
          endif

But the similar block of code in marbl_ciso_mod is

       if (column_zw < 3300.0e2_r8) then
          flux = P_CaCO3_ciso%sflux_out(k) + P_CaCO3_ciso%hflux_out(k)
          P_CaCO3_ciso%sed_loss(k) = flux
       endif

(There are probably other blocks of code that also need to be updated, this was the easiest to find to provide an example). Note that this is tied to #24 because we may end up removing zw from MARBL (so these threshold depths would be compared to zt)

[klindsay28]

The ciso version of CaCO3 burial does not depend on caco3_bury_thres_iopt, like the base ecosys version does. I think this qualifies as a bug.

I think this discrepancy would be caught if we implemented #204.

[mnlevy1981]

Fixed in marbl0.26.0