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/beans-standard-annotations.xml

@@ -150,7 +150,7 @@ component-scanning in the exact same way as when using Spring annotations:
               <row>
                 <entry>@Component</entry>
                 <entry>@Named</entry>
-                <entry>&mdash;</entry>
+                <entry>&#151;</entry>
               </row>
               <row>
                 <entry>@Scope("singleton")</entry>
@@ -174,21 +174,21 @@ component-scanning in the exact same way as when using Spring annotations:
               <row>
                 <entry>@Qualifier</entry>
                 <entry>@Named</entry>
-                <entry>&mdash;</entry>
+                <entry>&#151;</entry>
               </row>  
                <row>
                 <entry>@Value</entry>
-                <entry>&mdash;</entry>
+                <entry>&#151;</entry>
                 <entry>no equivalent</entry>
               </row> 
                <row>
                 <entry>@Required</entry>
-                <entry>&mdash;</entry>
+                <entry>&#151;</entry>
                 <entry>no equivalent</entry>
               </row> 
                <row>
                 <entry>@Lazy</entry>
-                <entry>&mdash;</entry>
+                <entry>&#151;</entry>
                 <entry>no equivalent</entry>
               </row> 
             </tbody>