Add some license headers.

contrib/fortran-to-opencl/translate.py

doc/make_constants.py

pyopencl/__init__.py

pyopencl/_cluda.py

pyopencl/algorithm.py

pyopencl/cache.py

pyopencl/characterize/__init__.py

pyopencl/characterize/performance.py

pyopencl/clmath.py

pyopencl/clrandom.py

pyopencl/compyte

test/test_array.py

test/test_clmath.py

test/test_wrapper.py