Rampy

- Minor correction of the `baseline()` documentation and removing a `print()` command.

- standardizatin in the `baseline()` function is now included (improve polynomial fits);

- addition of the arPLS algorithm from Baek et al. (2015) to automatic fit the baseline;

- addition of the whittaker smoother to fit the baseline (Eiler 2003);

- addition of the ALS algorithm (Eilers and Boelens 2005).