- 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
* added py-pycogent
* flake8 edits
* added type=('build', 'run') to deps, changed py-matplotlib and mpi4py
* changed python min version to 2.6
* fixed cython to py-cython dep
* fixed mpi4py to py-mpi4py
* fixed py-sqlalchemy
* added 1.5.3 version
* fixed version 1.5.3 install
* changed deps names to reflect convention
* added variants
* changed download URL and added SHA256 hash
* fixed deps
* added github url for 1.5.3
* removed unneeded deps
* doesn't require py-setuptools
* fixed url and added py-setuptools specific to version 1.9
* fixed variant names and changed cython to normal dependency instead of variant
* removed cython dep, failed to build when it was present. Changed variant name 'mpi4py' to 'mpi' and changed sqlalchemy variant name to mpi
* fixed dependencies and added py-pymysql dep
* added setup-environment step
* changed download url for 1.5.3 to pypi
* fixed flake8 issue
* updated
* added changes
