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/libcerf/package.py

@@ -26,7 +26,7 @@
 from spack import *
 
 
-class Libcerf(Package):
+class Libcerf(AutotoolsPackage):
     """A self-contained C library providing complex error functions, based
        on Faddeeva's plasma dispersion function w(z). Also provides Dawson's
        integral and Voigt's convolution of a Gaussian and a Lorentzian
@@ -37,13 +37,11 @@ class Libcerf(Package):
 
     version('1.3', 'b3504c467204df71e62aeccf73a25612')
 
-    def install(self, spec, prefix):
+    def configure_args(self):
         options = []
         # Clang reports unused functions as errors, see
         # http://clang.debian.net/status.php?version=3.8.1&key=UNUSED_FUNCTION
         if spec.satisfies('%clang'):
             options.append('CFLAGS=-Wno-unused-function')
 
-        configure('--prefix=%s' % prefix, *options)
-        make()
-        make("install")
+        return options