- merging parts of LLVM that can be built now.
- need to wait for standalone builds for some of the others.

- LLVM non-standalone add-ons are difficult to build outside LLVM.
- May have to wait for future versions of LLVM to build some of these

spack pkg list    [rev]           list packages for revision.
spack pkg diff    [rev1] [rev2]   diff bt/w packages in rev1 and rev2
spack pkg added   [rev1] [rev2]   pkgs added since rev1
spack pkg removed [rev1] [rev2]   pkgs removed since rev2

spack pkg list    [rev]           list packages for revision.
spack pkg diff    [rev1] [rev2]   diff bt/w packages in rev1 and rev2
spack pkg added   [rev1] [rev2]   pkgs added since rev1
spack pkg removed [rev1] [rev2]   pkgs removed since rev2

Conflicts:
	lib/spack/spack/packages.py

- Make spack packages RPATH *ALL* dependencies (i.e. the whole tree)
- prevents callpath link from finding wrong libelf -- always uses the one dyninst used.

# By David Beckingsale
# Via Todd Gamblin
* commit '42ca6c8b':
  Add dependency prefixes to CMAKE_PREFIX_PATH

- Better shell support for cd'ing into directories
- Fix some csh weirdness with nested aliases.

- add spack cd command.
- Fix bug in modules hook

Conflicts:
	lib/spack/spack/cmd/stage.py
	lib/spack/spack/hooks/dotkit.py
	share/spack/setup-env.bash

- Using the spec doesn't require the package to be there.
- Restore ability to use non-present packages (which was broken)

- Changed 'import argparse' to 'from external import argparse' in conflicts.

Conflicts:
	lib/spack/spack/cmd/dotkit.py
	lib/spack/spack/cmd/unuse.py
	lib/spack/spack/cmd/use.py

# By Todd Gamblin (4) and David Beckingsale (2)
# Via Todd Gamblin
* commit 'b601fd08':
  Bugfixes for csh environment modules.
  Bugfixes, more consolidation of modules code.
  Add csh/tcsh support for modules
  Consolidate most module code into spack.modules and spack.cmd.module
  Fixed up module support
  Added inital module support

- specific module classes use __metaclass__ to register themselves.
- bugfixes in module writing.

- csh scripting is a GIANT pain in the ass
- hopefully the thin script layer doesn't get much more complex.

- One file with all the module classes (spack/modules.py)
  - Has an EnvModule superclass that does most of the work and consolidates common code
  - Subclasses have specializations for different module systems (TclModule, Dotkit)

- One command (spack module) for all the types of modules to use
  - the one command is used by the scripts, only need to maintain in one place
  - has some subcommands for different module types, but they're handled mostly generically.

- Consolidate zsh support into a single setup-env.sh script.

- Updated version wildcard to include [a-z]|alpha|beta
  to accommodate all the letter suffixes on openssl.

- avoid errors where some symbols aren't exported to packages.
- reduce the number of places each symbol needs to be mentioned in
  an __all__ list