Zooplankton half-saturation ingestion constant

[arango]

The rate of phytoplankton ingestion by zooplankton is modeled using a Holling-type term that uses the half-saturation ingestion constant. This constant is used as squared value. To avoid squaring this constant over and over, it value is entered at input as (millimole/m3)^{2 in the FASHAM and NEMURO models. The documentation in bioFashan.in, nemuro.in, mod_biology.F, and inp_par.F has been updated to reflect the squared value.}