createIntegrationGrid   Create integration grid with the least number
                        of nodes, either using a sparse grid or a
                        product rule grid.
createMonteCarloGrid    Create a multidimensional grid of nodes and
                        weights for Monte Carlo integration
createProductRuleGrid   Create a multidimensional grid of nodes and
                        weights for integration
createSparseGrid        Create sparse grid
readASCGrid             Read integration grid from file
