Fix minor problems and polish reference docs

Problems

 - Eliminate — in favor of —

   — was causing 'no such entity' errors during docbook
   processing; — produces the equivalent output.

 - Fix column issues in appendices

   column counts were set to 3, when they are in fact 4. This passed
   under DocBook 4 and Spring Build for unknown reasons, but caused a
   hard stop under DocBook 5 and the docbook-reference-plugin.

 - Add jdbc callout section in docbook 5-friendly style

   use <co/> tags as advertised in DocBook documentation.

 - Set correct widths for PDF ref doc images

   images were rendering larger than the PDF page; just set all to
   width=400 and everything looks good.

Polish

 - Update reference doc copyright to 2012

 - Remove "work-in-progress" language from ref docs

 - Update maven URLs to repo.springsource.org

 - Update javadoc urls from 3.0.x/javadoc-api => current/api

 - Replace hardcoded "3.1" with ${version} in ref doc

src/reference/docbook/oxm.xml

@@ -185,8 +185,19 @@ public interface Unmarshaller {
             <para>
                 The O/X Mapping exception hierarchy is shown in the following figure:
                 <mediaobject>
-                    <imageobject>
-                        <imagedata fileref="images/oxm-exceptions.png" align="center"/>
+                    <imageobject role="fo">
+                      <imagedata align="center" fileref="images/oxm-exceptions.png"
+                          format="PNG" width="400"/>
+                    </imageobject>
+                    <caption>
+                        <para>
+                            O/X Mapping exception hierarchy
+                        </para>
+                    </caption>
+
+                    <imageobject role="html">
+                      <imagedata align="center" fileref="images/oxm-exceptions.png"
+                          format="PNG" width="400"/>
                     </imageobject>
                     <caption>
                         <para>
@@ -680,7 +691,7 @@ public class Application {
                   This will make sure that only the registered classes are eligible for unmarshalling.
                 </para>
                 <para>
-                  Additionally, you can register <ulink url="http://static.springsource.org/spring/docs/3.0.x/javadoc-api/org/springframework/oxm/xstream/XStreamMarshaller.html#setConverters(com.thoughtworks.xstream.converters.ConverterMatcher[])">
+                  Additionally, you can register <ulink url="http://static.springsource.org/spring/docs/current/api/org/springframework/oxm/xstream/XStreamMarshaller.html#setConverters(com.thoughtworks.xstream.converters.ConverterMatcher[])">
                   custom converters</ulink> to make sure that only your supported classes can be unmarshalled.
                 </para>
             </warning>