many fixes

README.md

ci/scripts/test.sh

hysop/__init__.py.in

hysop/backend/device/autotunable_kernel.py

hysop/backend/device/codegen/base/codegen.py

hysop/backend/device/codegen/base/struct_codegen.py

hysop/backend/device/codegen/base/variables.py

hysop/backend/device/codegen/functions/apply_stencil.py

hysop/backend/device/codegen/functions/cache_load.py

hysop/backend/device/codegen/functions/compute_index.py

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

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

...egen/kernels/tests/test_codegen_directional_stretching.py

...nd/device/codegen/kernels/tests/test_codegen_transpose.py

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

hysop/backend/device/codegen/symbolic/expr.py

...odegen/symbolic/kernels/custom_symbolic_time_integrate.py

hysop/backend/device/kernel_autotuner.py

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

hysop/backend/device/opencl/clpeak.py