trying to fix lbnode set u
seems to work except fails test case
fixed reference for object_in_fluid.tcl and added a gpu test
small fix to new object_in_fluid_gpu.tcl testcase, added some comments to cuda_common.cu
Added automatic recompile of cuda files with changes to myconfig.h, note that not all dependencies are included so there can still be trouble with compiling cuda files.
Merge pull request #100 from ohickey/p3m_accuracy

P3m accuracy