- 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 a package for the MDAnalysis toolkit.
* Added a new package for pygpu, which is the python front end of the
libgpuarray. Additionally changed the dependency for theano so that
it properly picks up the pygpu library.
* Added the libcheck package. Fixed flake8 errors in py-pygpu recipe
and removed spurious dependency on cudnn for libgpuarray.
* Added support for building Theano with GPU support. Added a package
for the libgpuarry libary needed for Theano.
* Added dependency on py-pexpect package which ipython requires.
