Simulation of Macroscopic congested crowd motion (density < 1)
using a direct JKO approach in the spirit of
Maury-Roudneff-Santambroggio. Guys are heading to (2,0) and are repelled from the center by
a gaussian potential. Boundaries let people exit.
Credits : Oudet/Merigot (LJK Gernoble) + Carlier/Benamou Mokaplan.