working opencl compute_energy kernel (non optimized)

ci/scripts/test.sh

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

...device/codegen/symbolic/kernels/custom_symbolic_affect.py

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

hysop/numerics/fft/host_fft.py

hysop/numerics/fft/opencl_fft.py

hysop/operator/base/custom_symbolic_operator.py

hysop/parameters/tensor_parameter.py

hysop/symbolic/complex.py

hysop/symbolic/misc.py

test_examples.sh