use autoreconf in autogen.sh

* autogen.sh: use autoreconf instead of the direct set of calls for
  auto* updates
* INSTALL INSTALL.libxml2: migrate the INSTALL to INSTALL.libxml2 since
  autoreconf copies a new INSTALL
diff --git a/autogen.sh b/autogen.sh
index 9dc7c33..da732be 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -46,10 +46,12 @@
         echo "to pass any to it, please specify them on the $0 command line."
 fi
 
-libtoolize --copy --force
-aclocal $ACLOCAL_FLAGS
-automake --force-missing --add-missing --copy --foreign
-autoconf
+# Replaced by autoreconf below
+#libtoolize --copy --force
+#aclocal $ACLOCAL_FLAGS
+#automake --force-missing --add-missing --copy --foreign
+#autoconf
+autoreconf -if
 
 cd $THEDIR
 
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