added the official license header

CMakeLists.txt

install_scripts/install_mingw.sh

setup/setup_externals.sh

setup_lin/buildenv_focal.sh

tools/cif2xml/CMakeLists.txt

tools/cif2xml/cif2xml.cpp

tools/cif2xml/findsg.cpp

tools/magsgbrowser/CMakeLists.txt

tools/magsgbrowser/browser.cpp

tools/magsgbrowser/browser.h

tools/magsgbrowser/main.cpp

tools/magstructfact/CMakeLists.txt

tools/magstructfact/magstructfact.cpp

tools/magstructfact/magstructfact.h

tools/moldyn/CMakeLists.txt

tools/moldyn/moldyn-loader.h

tools/moldyn/moldyn-test.cpp

tools/moldyn/moldyn.cpp

tools/moldyn/moldyn.h

tools/moldyn/setup_mingw.sh