New librairies: regionmask, salem and climetlab

[matthieusorel]

Hi,

Could you add the following librairies:

• regionmask: https://regionmask.readthedocs.io/
• salem: https://salem.readthedocs.io/
• climetlab: https://climetlab.readthedocs.io/en/latest/

Thanks,
Matthieu.

[thebaptiste]

I will add regionmask and salem
For the time being we can't add climetlab because of a problem on it's dependency ecmwflibs.

[thebaptiste]

There was a problem on source distribution of salem (see issue here) but thanks to @fmaussion, it was solved within a day.

[thebaptiste]

Still a problem on ecmwflibs, PR 168 doesn't build on CentOS6 in our continuous integration system (we build on CentOS6 with recent compilers for compatibility with most of the linux distributions, including Centos6).
I can provide an other specific addon (let's say mfextaddon_scientific_extra) to provide climetlab (built on CentOS7, so you won't be able to install it on CentOS6 systems). Would it be suitable for your need ?