Discretization Methods

For generateJuMPcodes, choose different discretization methods by passing name of method to discretization

Single-step Method Supported

\[f_i = f(x_i,y_i)\]

\[y_{i+i}=y_i+\frac{h}{2}[f_i+f_{i+1}]\\ R[y]=-\frac{h^3}{12}y^{(3)}(\xi_i)\]