Prolongation

Useful references:

• Mongwane - Toward a Consistent Framework for High Order Mesh Refinement Schemes in Numerical Relativity, https://arxiv.org/abs/1504.07609
• Carpenter et al. - The Theoretical Accuracy of Runge--Kutta Time Discretizations for the Initial Boundary Value Problem: A Study of the Boundary Error, http://epubs.siam.org/doi/abs/10.1137/0916072
• Shen - Adaptive mesh refinement based on high order finite difference WENO scheme for multi-scale simulations, http://www.sciencedirect.com/science/article/pii/S0021999111000908?via%3Dihub