Add external package with pyqver2 tool
Add a test case to ensure that Spack is v2.6 compliant.
Remvoe dependence on v2.7 argparse by including argparse.
Fix SPACK-27 & remove dependence on check_output

- subprocess.check_output is python 2.7 only
- Spack checks for existence of requested prefix, creates it if it does not exist.
Change dict comprehensions to dict() constructors.
Fix minor warning about Exception.message being deprecated.
Add Python 2.7 functools.total_ordering to external modules.

- removing dependence on 2.7
- added it to pyqver2 ads well
Remove dependency on Python2.7 OrderedDict, revise config parser
Get rid of Python 2.7 dict.viewkeys() call.
cc supports Python 2.6
Test cases pass; Spack supports Python 2.6!
More robust symbol inclusion for 'from spack import *'

- 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
Allow packages to add a dotkit() method and write custom parts of dotkits.
Package for postgresql.
Add options to stage to make it just print out stage dir.
Add "spack cd" shell support to cd directly into the staged archive.
Add package for openssl, have postgres use it.

- Updated version wildcard to include [a-z]|alpha|beta
  to accommodate all the letter suffixes on openssl.
Add Kevin's experimental TAU version
new prototype TAU tarball from Kevin
update tau tarball