Link to salib for sensitivity analysis

[MichaelClerx]

SA seems like an obvious third main function for Pints

https://salib.readthedocs.io/en/latest/

[chonlei]

Do we have any algorithm that actually uses global sensitivity?! I think all are local sensitivity only.

Why do we want global sensitivity in Pints?

[MichaelClerx]

Not for the algorithms, just because it's useful to do the analysis!