Expand Chinook mortality table using Model-Stock Proportion
Source:R/msp_mortality.R
      msp_mortality.RdSee https://framverse.github.io/fram_doc/calcs_data_chin.html#46_Model-Stock_Proportion.
R/msp_mortality.R
      msp_mortality.RdSee https://framverse.github.io/fram_doc/calcs_data_chin.html#46_Model-Stock_Proportion.