v0.6 release to reproduce analysis in the description paper

This release provides the state of the reference implementation as described in the (currently in press at Earth System Dynamics):

Earth system modeling with endogenous and dynamic human societies: the copan:CORE open World-Earth modeling framework
Jonathan F. Donges, Jobst Heitzig, Wolfram Barfuss, Marc Wiedermann, Johannes A. Kassel, Tim Kittel, Jakob J. Kolb, Till Kolster, Finn Müller-Hansen, Ilona M. Otto, Kilian B. Zimmerer, Wolfgang Lucht

A preprint of the paper is found here: https://arxiv.org/abs/1909.13697

Pre-release for the comses 2019 conference

v0.53

FIXED a BUG in runner: some derivatives were added twice!

pycopancore v0.52 release along with model description paper

This is the version of pycopancore v0.52 released along with the model description paper:

J.F. Donges*, J. Heitzig*, W. Barfuss, J.A. Kassel, T. Kittel, J.J. Kolb, T. Kolster, F. Müller-Hansen, I.M. Otto, M. Wiedermann, K.B. Zimmerer, and W. Lucht, Earth system modelling with complex dynamic human societies: the copan:CORE World-Earth modeling framework, Earth System Dynamics Discussions, in review (2018), doi: 10.5194/esd-2017-126, * The first two authors share the lead authorship.