Added copyright statements and license.

LICENSE.txt

parser/parser-gpaw/default_parameters.py

parser/parser-gpaw/libxc_names.py

parser/parser-gpaw/parser.py

parser/parser-gpaw/parser2.py

parser/parser-gpaw/setup_paths.py

parser/parser-gpaw/tar.py

parser/parser-gpaw/versions.py

src/main/scala/eu/nomad_lab/parsers/GpawParser.scala

src/main/scala/eu/nomad_lab/parsers/GpawParser2.scala

src/test/scala/eu/nomad_lab/parsers/GpawParserSpec.scala

test/examples/H2.py

test/examples/Si.py