Merge branch 'add-license-headers' into 'master'

src/bitlog.cpp

src/bitlog.hpp

src/mempool.hpp

src/numpy_init.hpp

src/tools.hpp

src/wrap_cl.cpp

src/wrap_cl.hpp

src/wrap_cl_part_1.cpp

src/wrap_cl_part_2.cpp

src/wrap_constants.cpp

src/wrap_helpers.hpp

src/wrap_mempool.cpp