Updates in SDAlgorithms

[shishiousan]

Implementing some well-known semi discrete time integration schemes

• HHT alpha method
• Collocation schemes including Wilson theta method
• Houbolt's method

[shishiousan]

now you can set SDAlgoParam_ for HHT alpha and Collocation methods by

TYPE(SDAlgoParam_) :: obj

call obj%HHTAlpha(alpha=alpha, beta=beta, gamma=gamma)

call obj%Collocation(beta=beta, gamma=gamma, theta=theta)

Since the Houbolt method needs a somewhat different structure, its implementation is future work.