Implemented first version of convergence rate function for general app
Implemented first version of convergence rate function for general app

giorgiobornia/femus,saikanth88/femus,saikanth88/femus,saikanth88/femus,FeMTTU/femus,giorgiobornia/femus,FeMTTU/femus,FeMTTU/femus,FeMTTU/femus,giorgiobornia/femus,giorgiobornia/femus,saikanth88/femus