- 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
* First draft of amrvis package file.
* More additions to amrvis.
* Formatting.
* Forcing compiler environment variables to point to spack mpi compilers when using mpi.
* Disabling intel compiler for amrvis.
* Comments.
* Refining amrvis package file.
* Moving library and include locations variables to be inserted at the first lines of the makefile.
* Globbing amrvis binary instead of constructing its name.
* Making env variable setting consistent and fixing globbing of executable.
* Using iglob instead of glob.
* Turning MPI on by default for Amrvis.
