kernel autotuner complete remake

hysop/backend/device/__init__.py

...p/backend/device/codegen/kernels/directional_advection.py

hysop/backend/device/codegen/kernels/directional_remesh.py

.../backend/device/codegen/kernels/directional_stretching.py

hysop/backend/device/codegen/kernels/transpose.py

hysop/backend/device/kernel_autotuner.py

hysop/backend/device/kernel_autotuner_config.py

hysop/backend/device/kernel_config.py

hysop/backend/device/opencl/__init__.py

hysop/backend/device/opencl/opencl_autotuner_config.py

hysop/backend/device/opencl/opencl_env.py

hysop/backend/device/opencl/opencl_kernel_autotuner.py

...p/backend/device/opencl/opencl_kernel_autotuner_config.py

hysop/backend/device/opencl/opencl_kernel_config.py

hysop/backend/device/opencl/opencl_operator.py

hysop/backend/device/opencl/opencl_tunable_kernel.py

...ckend/device/opencl/operator/directional/advection_dir.py

...kend/device/opencl/operator/directional/stretching_dir.py

hysop/backend/device/opencl/operator/transpose.py

hysop/backend/device/opencl/tunable_kernels/__init__.py