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/openblas/package.py

@@ -0,0 +1,25 @@
+from spack import *
+
+class Openblas(Package):
+    """OpenBLAS: An optimized BLAS library"""
+    homepage = "http://www.openblas.net"
+    url      = "http://github.com/xianyi/OpenBLAS/archive/v0.2.15.tar.gz"
+
+    version('0.2.15', 'b1190f3d3471685f17cfd1ec1d252ac9')
+
+    # virtual dependency
+    provides('blas')
+    provides('lapack')
+
+    def install(self, spec, prefix):
+        make('libs', 'netlib', 'shared', 'CC=cc', 'FC=f77')
+        make('install', "PREFIX='%s'" % prefix)
+
+        # Blas virtual package should provide blas.a and libblas.a
+        with working_dir(prefix.lib):
+            symlink('libopenblas.a', 'blas.a')
+            symlink('libopenblas.a', 'libblas.a')
+
+        # Lapack virtual package should provide liblapack.a
+        with working_dir(prefix.lib):
+            symlink('libopenblas.a', 'liblapack.a')