Revert to GNU GPLv3 License

COPYING

LICENSE.txt

README.md

build/README.md

containers/docker/README.md

containers/singularity/README.md

doc/src/README.md

src/README.md

src/cluster/cluster.cpp

src/cluster/np_cluster.cpp

src/include/Commons.h

src/include/Configuration.h

src/include/TransitionMatrix.h

src/include/algebraic.h

src/include/clu_subs.h

src/include/lapack_calls.h

src/include/logging.h

src/include/magma_calls.h

src/include/sph_subs.h

src/include/tfrfme.h