Merge remote-tracking branch 'upstream/develop' into pkg-subversion

etc/spack/modules.yaml

lib/spack/llnl/util/filesystem.py

lib/spack/llnl/util/lang.py

lib/spack/spack/build_environment.py

lib/spack/spack/cmd/info.py

lib/spack/spack/concretize.py

lib/spack/spack/config.py

lib/spack/spack/modules.py

lib/spack/spack/package.py

lib/spack/spack/test/concretize.py

var/spack/repos/builtin.mock/packages/python/package.py

var/spack/repos/builtin/packages/arpack-ng/package.py

var/spack/repos/builtin/packages/arpack-ng/pdlamch10.patch

var/spack/repos/builtin/packages/atlas/package.py

var/spack/repos/builtin/packages/boost/package.py

var/spack/repos/builtin/packages/cmake/package.py

var/spack/repos/builtin/packages/cryptopp/package.py

var/spack/repos/builtin/packages/eigen/package.py

var/spack/repos/builtin/packages/espresso/package.py

var/spack/repos/builtin/packages/gettext/package.py