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/xz/package.py

@@ -25,7 +25,7 @@
 from spack import *
 
 
-class Xz(Package):
+class Xz(AutotoolsPackage):
     """XZ Utils is free general-purpose data compression software with
        high compression ratio. XZ Utils were written for POSIX-like
        systems, but also work on some not-so-POSIX systems. XZ Utils are
@@ -35,11 +35,3 @@ class Xz(Package):
 
     version('5.2.0', '867cc8611760240ebf3440bd6e170bb9')
     version('5.2.2', 'f90c9a0c8b259aee2234c4e0d7fd70af')
-
-    def install(self, spec, prefix):
-        configure('--prefix={0}'.format(prefix))
-
-        make()
-        if self.run_tests:
-            make('check')
-        make('install')