- 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
* py-cdat-lite: a python package for managing and analysing climate science data
* py-cdat-lite: depends on py-numpy
* py-cdat-lite: flake8 compliance
* py-cdat-lite: provide a generic URL where multiple versions are listed
* py-cdat-lite: restrict python versions; python required at run-time
* py-cdat-lite: use URL under pypi.io for consistency with other packages
* py-cdat-lite: add run-time dependency on py-numpy
