Pass scheme specific parameters as cell array. This will enabale constructDiffOps to be more general. In addition, allow for schemes returning function handles as diffOps, which is currently how non-linear schemes such as Burgers1d are implemented.

# SBPLIB
sbplib is a library of primitives and help functions for working with summation-by-parts finite differences in Matlab. To use sbplib download the code and add the sbplib folder to the matlab path.