Update copyrights

CMakeLists.txt

hqr_env.sh.in

include/libhqr.h

include/libhqr_internal.h

include/libhqr_list.h

include/libhqr_queue.h

src/check.c

src/gendot.c

src/gensvg.c

src/high_binary.c

src/high_fibonacci.c

src/high_flat.c

src/high_greedy.c

src/hqr.c

src/low_adaptiv.c

src/low_binary.c

src/low_fibonacci.c

src/low_flat.c

src/low_greedy.c

src/low_greedy1p.c