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/libedit/package.py

@@ -0,0 +1,14 @@
+from spack import *
+
+class Libedit(Package):
+    """An autotools compatible port of the NetBSD editline library"""
+    homepage = "http://thrysoee.dk/editline/"
+    url      = "http://thrysoee.dk/editline/libedit-20150325-3.1.tar.gz"
+
+    version('3.1', '43cdb5df3061d78b5e9d59109871b4f6', url="http://thrysoee.dk/editline/libedit-20150325-3.1.tar.gz")
+
+    def install(self, spec, prefix):
+        configure('--prefix=%s' % prefix)
+
+        make()
+        make("install")