Merge pull request #1015 from LLNL/features/faster-virtuals

.gitignore

lib/spack/llnl/util/lock.py

lib/spack/spack/__init__.py

lib/spack/spack/architecture.py

lib/spack/spack/cmd/purge.py

lib/spack/spack/cmd/test.py

lib/spack/spack/cmd/uninstall.py

lib/spack/spack/config.py

lib/spack/spack/database.py

lib/spack/spack/file_cache.py

lib/spack/spack/modules.py

lib/spack/spack/package.py

lib/spack/spack/provider_index.py

lib/spack/spack/repository.py

lib/spack/spack/spec.py

lib/spack/spack/stage.py

lib/spack/spack/test/__init__.py

lib/spack/spack/test/architecture.py

lib/spack/spack/test/concretize.py

lib/spack/spack/test/database.py