Provisions for Coastal Grasses

This tag contains key changes that enable simulation of a coastal salt marsh. Key features are 1) an allowance that when maximum height/dbh reached, all the carbons goes to the bstore for grasses; 2) when plant dies, bstore goes to reproduction for grasses; 3) recruitment only happens at the growing seasons so that the newly developed cohorts are viable; 4) add a new capability to simulate the impact of salinity and sulphide through btran; and 5) a
new parameter file for Spartina.
These changes were developed by Joel Rowland and Chonggang Xu, with help from Rosie Fisher, Charlie Koven and Ryan Knox.