HMcode-2020 problem with feedback at low k

[alexander-mead]

It has been bought to my attention that there is a small problem with the HMcode-2020 feedback recipe at low k. Baryonic feedback should have a negligible effect on P(k) for k < 1e-2 h/Mpc, however, the HMcode-2020 feedback model erroneously predicts ~10% level effects at k = 1e-4 h/Mpc.

This is a bug, which I have now fixed. The before and after can be seen here:

Before:

After:

Are you able to give me permission to push my new branch, with the correction, to the CAMB repository? I think you can do this while protecting the master branch.

[cmbant]

Thanks - just generate a pull request from your own site? Usually easiest.