Merge 4.x update

[florianhartig]

Create a new issue to discuss the 4.x update. What I would suggest is

a) @JohannesOberpriller - can you create a branch for this, and possibly a pre-release (compiled), so that people can beta-test it?

b) I will then do the merge.

One question: will this then remain compatible with 3.1?

[JohannesOberpriller]

I will create the branch after i further tested the package in the next few days.

@florianhartig to your question: Yes, i think so! At least i tested this a few months ago. This was one of my two data points (LPJ-GUESS versions) to test validity of the new features.

[cbbenavidez]

Hi @florianhartig and @JohannesOberpriller, thanks for your responses. Yes, I am testing the official version (not the education version), I can collaborate in whatever you consider necessary in the advancement of this new compilation of the package.

[JohannesOberpriller]

Hi @cbbenavidez i have now set up the develop branch and uploaded the compiled version as a pre-release. Feel free to test it, if you want and if you should find any bugs report them as new issues.