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/mpfr/package.py

@@ -25,7 +25,7 @@
 from spack import *
 
 
-class Mpfr(Package):
+class Mpfr(AutotoolsPackage):
     """The MPFR library is a C library for multiple-precision
        floating-point computations with correct rounding."""
     homepage = "http://www.mpfr.org"
@@ -36,8 +36,3 @@ class Mpfr(Package):
     version('3.1.2', 'ee2c3ac63bf0c2359bf08fc3ee094c19')
 
     depends_on('gmp')  # mpir is a drop-in replacement for this
-
-    def install(self, spec, prefix):
-        configure("--prefix=%s" % prefix)
-        make()
-        make("install")