… through Jenkins, but I'm not sure that it will also perform as expected. The code passes the testcases I've tried, but whether the physics of the LB_BOUNDARIES(_GPU) is correct I cannot vouch for. I've also changed a line of code that was erronously commented out by Dominic.

… lb_stokes_sphere_gpu.tcl test case still fails. I think there is a mysterious factor of 2 floating around somewhere in the code. I've added several comments to where I was uncertain about a piece of code, always with // ***** (lb_boundaries.c and lbgpu.cu). For the rest I think I've removed pretty much all the mess that was there.

…r for the random_tcl.c file, for which their implementation lead to unexpected and undesired behavior.