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/pcre2/package.py

@@ -25,7 +25,7 @@
 from spack import *
 
 
-class Pcre2(Package):
+class Pcre2(AutotoolsPackage):
     """The PCRE2 package contains Perl Compatible Regular Expression
        libraries. These are useful for implementing regular expression
        pattern matching using the same syntax and semantics as Perl 5."""
@@ -33,8 +33,3 @@ class Pcre2(Package):
     url      = "ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre2-10.20.tar.bz2"
 
     version('10.20', 'dcd027c57ecfdc8a6c3af9d0acf5e3f7')
-
-    def install(self, spec, prefix):
-        configure("--prefix=%s" % prefix)
-        make()
-        make("install")