- remove the old LGPL license headers from all files in Spack
- add SPDX headers to all files
- core and most packages are (Apache-2.0 OR MIT)
- a very small number of remaining packages are LGPL-2.1-only
* ncurses package will build ncurses and ncursesw
* Added libs property to ncurses, added fix for hstr
* flake8 is a harsh mistress
* make libs() more robust
* atop depends on ncurses
* fish depends on ncurses
* libtermkey and nano depend on ncurses
* Adjust url spacing
