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/harfbuzz/package.py

@@ -25,7 +25,7 @@
 from spack import *
 
 
-class Harfbuzz(Package):
+class Harfbuzz(AutotoolsPackage):
     """The Harfbuzz package contains an OpenType text shaping engine."""
     homepage = "http://www.freedesktop.org/wiki/Software/HarfBuzz/"
     url      = "http://www.freedesktop.org/software/harfbuzz/release/harfbuzz-0.9.37.tar.bz2"
@@ -41,8 +41,3 @@ class Harfbuzz(Package):
 
     def patch(self):
         change_sed_delimiter('@', ';', 'src/Makefile.in')
-
-    def install(self, spec, prefix):
-        configure("--prefix=%s" % prefix)
-        make()
-        make("install")