Interpolation Boundary condition

Implements a Linear Bouzidi boundary condition. This is an interpolated version of a NoSlip BC and described here: https://doi.org/10.1063/1.1399290

Implements the quadratic bounce back. This is an interpolated version of a NoSlip BC and described here in Appendix E: https://www.sciencedirect.com/science/article/pii/S0898122115002126

The advantage of the latter is that it does not need a second fluid cell. Thus, all optimizations can be applied as usual.