pism/pik/pico_dev: PISM+PICO version as used in Reese et al. The Cryosphere publication

This is a code release of the Parallel Ice Sheet Model (PISM) together with the Potsdam Ice-shelf Cavity mOdel (PICO) as used for simulations presented in Reese et al., The Cryosphere; forthcoming. For input data and plotting scripts please contact the authors (reese@pik-potsdam.de,winkelmann@pik-potsdam.de).

For further use of PICO, please refer to the latest version on https://github.com/pism/pism/commits/dev.