- New spack.hooks package
- contains modules with pre and post install hooks
- New dotkit hook module
- generates/removes dotkits on install/uninstall
- New spack use, spack unuse commands
- use same syntax as install/uninstall
- New setup-env.bash script
- Sets up path, dotkit support
- new spack dotkit command
- used by script to parse specs, generate
specs of installed pckages for dotkit file names
