Final version of UW1

Legacy release of UW1.

Please consider migrating to Underworld version 2

If you use UW1, please cite the following paper:

Moresi, L., Moresi, L. N., S. Quenette, V. Lemiale, C. Mériaux, B. Appelbe, W. Appelbe, H. B. Muhlhaus, Mühlhaus (2007), Computational approaches to studying non-linear dynamics of the crust and mantle, Physics of the Earth and Planetary Interiors, 163(1-4), 69–82, doi:10.1016/j.pepi.2007.06.009.

There is a DOI for the UW1 code itself: DOI: 10.5281/zenodo.1445812