Massive conversion from Package to AutotoolsPackage (#2845)

* Massive conversion from Package to AutotoolsPackage

* Forgot to convert p4est to AutotoolsPackage

* Fix typo

* Fix broken link in docs

var/spack/repos/builtin/packages/sed/package.py

@@ -25,15 +25,9 @@
 from spack import *
 
 
-class Sed(Package):
+class Sed(AutotoolsPackage):
     """GNU implementation of the famous stream editor."""
     homepage = "http://www.gnu.org/software/sed/"
     url      = "http://ftpmirror.gnu.org/sed/sed-4.2.2.tar.bz2"
 
     version('4.2.2', '7ffe1c7cdc3233e1e0c4b502df253974')
-
-    def install(self, spec, prefix):
-        configure('--prefix=%s' % prefix)
-
-        make()
-        make("install")