New default value for ACCURACY FOR DIFFUSION OF TRACERS in 2D
Old default value for ACCURACY FOR DIFFUSION OF TRACERS = 1.E-6 in TELEMAC-2D. As default choice for SCHEME FOR ADVECTION OF TRACERS is now NERD scheme = 13 in TELEMAC-2D (see #1002 (closed)), which is a mass-conservative scheme, the ACCURACY FOR DIFFUSION OF TRACERS can be finer, like 1.E-8 as in TELEMAC-3D. Mass-conservation should then be improved.