Merge pull request sphexa-org#93 from unibas-dmi-hpc/spack

Adding spack recipe

Merge pull request sphexa-org#85 from unibas-dmi-hpc/focus-domain

Focus domain

Merge pull request sphexa-org#82 from unibas-dmi-hpc/fix-cmake-cuda

fix CMake CUDA language detection

Fixed cuda memory leak

Gravity (sphexa-org#69)

* fixed evrard test with gpu-branch

* added ali's schedule pragmas to really slow gravity computation

* restored normal smoothing length to fix scalability

* removed static scheduling

* added test files

remove sin and cos lookup table