currently evaporationatmosphere runs on ALU instead of UG, as it used

to. 

ALU has a different convergence behavior than UG, leading to different
timestep sizes. UG and ALU have the same (fuzzy) result if the timestep
is limited to one second. 

Therefore, an update of the reference solution, indirectly caused by the
change of grid managers, seems justified. 
Discussed with Bernd and Christoph


git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@12654 2fb0f335-1f38-0410-981e-8018bf24f1b0