Merge branch 'mplegendre-multi_pkgsrc_roots' into develop

- This moves var/spack/packages to var/spack/repos/builtin/packages.

- Packages that did not exist in the source branch, or were changed in
  develop, were moved into var/spack/repos/builtin/packages as part of
  the integration.

Conflicts:
	lib/spack/spack/test/unit_install.py
	var/spack/repos/builtin/packages/clang/package.py

var/spack/repos/builtin/packages/py-numpy/package.py

@@ -0,0 +1,24 @@
+from spack import *
+
+class PyNumpy(Package):
+    """array processing for numbers, strings, records, and objects."""
+    homepage = "https://pypi.python.org/pypi/numpy"
+    url      = "https://pypi.python.org/packages/source/n/numpy/numpy-1.9.1.tar.gz"
+
+    version('1.9.1', '78842b73560ec378142665e712ae4ad9')
+    version('1.9.2', 'a1ed53432dbcd256398898d35bc8e645')
+
+    variant('blas', default=True)
+
+    extends('python')
+    depends_on('py-nose')
+    depends_on('netlib-blas+fpic', when='+blas')
+    depends_on('netlib-lapack+shared', when='+blas')
+
+    def install(self, spec, prefix):
+        if '+blas' in spec:
+            with open('site.cfg', 'w') as f:
+                f.write('[DEFAULT]\n')
+                f.write('libraries=lapack,blas\n')
+                f.write('library_dirs=%s/lib:%s/lib\n' % (spec['blas'].prefix, spec['lapack'].prefix))
+        python('setup.py', 'install', '--prefix=%s' % prefix)