CLUMPY v3: $\gamma$-ray and $\nu$ signals from dark matter at all scales

We present the third release of the CLUMPY code for calculating $\gamma$-ray and $\nu$ signals from annihilations or decays in dark matter structures. This version includes the mean extragalactic signal with several pre-defined options and keywords related to cosmological parameters, mass functions for the dark matter structures, and $\gamma$-ray absorption up to high redshift. For more flexibility and consistency, dark matter halo masses and concentrations are now defined with respect to a user-defined overdensity $\Delta$. We have also made changes for the user's benefit: distribution and versioning of the code via \git{}, less dependencies and a simplified installation, better handling of options in run command lines, consistent naming of parameters, and a new Sphinx documentation at http://lpsc.in2p3.fr/clumpy/.