- 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
* amg2013: fix homepage and url
* kripke: fix homepage and url
* lcals: fix homepage and url
* lulesh: fix homepage and move to git
* urls on single line
* New Pacakge: lcals
* added logic for arch detection and compiler choice.
* fixes for comments.
* addressed comments.
* removed LCALS_ARCH and added flags though spack.
* addressed comments.
* flake 8 fix.
* reerted the changes along with comments.
