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/libxmu/package.py

@@ -25,7 +25,7 @@
 from spack import *
 
 
-class Libxmu(Package):
+class Libxmu(AutotoolsPackage):
     """This library contains miscellaneous utilities and is not part of the
     Xlib standard.  It contains routines which only use public interfaces so
     that it may be layered on top of any proprietary implementation of Xlib
@@ -43,9 +43,3 @@ class Libxmu(Package):
     depends_on('xextproto', type='build')
     depends_on('pkg-config@0.9.0:', type='build')
     depends_on('util-macros', type='build')
-
-    def install(self, spec, prefix):
-        configure('--prefix={0}'.format(prefix))
-
-        make()
-        make('install')