moved opencl and fortran backends

.gitignore

hysop/__init__.py

hysop/backend/fortran/__init__.py

hysop/backend/fortran/poisson.py

hysop/backend/opencl/__init__.py

hysop/backend/opencl/_platform.py

hysop/backend/opencl/backend.py

hysop/backend/opencl/clenv.py

hysop/backend/opencl/cltypes.py

hysop/backend/opencl/device.py

hysop/backend/opencl/device_config.py

hysop/backend/opencl/directional/__init__.py

hysop/backend/opencl/directional/advection_dir.py

hysop/backend/opencl/directional/directional_codegen.py

hysop/backend/opencl/discrete.py

hysop/backend/opencl/kernel_autotuner.py

hysop/backend/opencl/opencl_codegen.py

hysop/backend/opencl/opencl_discrete.py

hysop/backend/opencl/opencl_kernel.py

hysop/backend/opencl/opencl_operator.py