- 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
* add 1.4.13.4 for SZ
* undo spack link (change llnl/spack to spack/spack) and change .zip to .tar.gz
* revise package.py for SZ 1.4.13.4 based on Adam's comments.
* ADIOS 1.13.1
ADIOS 1.13.1 fixes several issues with zero-sized block
reading and writing when compression transports are used.
* SZ 1.4.12.3
Add the lastest SZ release used in ADIOS1.
