- Remove GL20 and GL40 by merging them into GaussLegendre (renamed GLNP)
- Rename GaussKonrod to GaussKronrod (missing r)
- Chebyshev interpolation
- Various modifications to MatrixD and VectorD
- Added ElementaryUtils dependence to NumA_Test
- Adapted NumA_Test to take into account the change in GaussLegendre (with 5 different orders)

- Massive rewriting of the Gap Equation solver (for now only Bad Broyden available)