Declare all kernel values const that are const
Merge remote-tracking branch 'chiel/cuda' into cuda
Fixed a bug in diffusion, TG works
Use correct dzhi4 in diffusion
Merge branch 'bartcuda' into cuda
Merge remote-tracking branch 'chiel/cuda' into cuda
Test with reduction (max) using Thrust. Works, but very ugly with the need to set the tmp array to zero..