CryoGrid community model version 1.0

First release of the CryoGrid community model, which comprises different subsurface modules for permafrost applications. Bug fixes will be tagged as ver1.1, ver1.2, etc, and new releases with added functionality will be tagged ver2.0, ver3.0, etc.

Main contributers:
Sebastian Westermann, Thomas Ingeman-Nielsen, Johanna Scheer, Robin Zweigel, Léo Martin