Explicitly compute Coulomb Stressing Rate
Refactored the Coulomb stressing rate equation in RSODE model to include a normal stressing rate term. Also included an initial_normal_stressing_rate parameter and exposed it to the user.
Refactored the Coulomb stressing rate equation in RSODE model to include a normal stressing rate term. Also included an initial_normal_stressing_rate parameter and exposed it to the user.