Bug 344731: Update documentation minimum versions automatically

docs/en/xml/Bugzilla-Guide.xml

-<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" [
+<?xml version="1.0"?>
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
+                      "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" [
+    <!ENTITY % myents SYSTEM "bugzilla.ent">
+    %myents;
 
 <!-- Include macros -->
 <!ENTITY about SYSTEM "about.xml">
@@ -41,35 +45,8 @@
 <!ENTITY bzg-bugs "<ulink url='http://bugzilla.mozilla.org/enter_bug.cgi?product=Bugzilla&amp;component=Documentation'>Bugzilla Documentation</ulink>">
 <!ENTITY mysql "http://www.mysql.com/">
 
-<!-- For minimum versions -->
-<!ENTITY min-mysql-ver "4.0.14">
-<!ENTITY min-pg-ver "8.0.0">
 <!ENTITY min-perl-ver "5.8.0">
 <!ENTITY min-perl-ver-win "5.8.1">
-<!ENTITY min-template-ver "2.08">
-<!ENTITY min-file-temp-ver "any">
-<!ENTITY min-appconfig-ver "1.52">
-<!ENTITY min-text-wrap-ver "2001.0131">
-<!ENTITY min-file-spec-ver "0.84">
-<!ENTITY min-data-dumper-ver "any">
-<!ENTITY min-dbd-mysql-ver "2.9003">
-<!ENTITY min-dbd-pg-ver "1.45">
-<!ENTITY min-dbi-ver "1.38">
-<!ENTITY min-date-format-ver "2.21">
-<!ENTITY min-cgi-ver "2.93">
-<!ENTITY min-mail-mailer-ver "1.67">
-<!ENTITY min-mime-base64-ver "3.01">
-<!ENTITY min-mime-parser-ver "5.406">
-<!ENTITY min-storable-ver "any">
-<!-- Optional modules -->
-<!ENTITY min-gd-ver "1.20">
-<!ENTITY min-gd-graph-ver "any">
-<!ENTITY min-gd-text-align-ver "any">
-<!ENTITY min-chart-base-ver "1.0">
-<!ENTITY min-xml-parser-ver "any">
-<!ENTITY min-patchreader-ver "0.9.4">
-<!ENTITY min-image-magick-ver "any">
-
 ]>