Added wiki annotate view. It's accessible for each version from the page history view.

Slight style change: pre-wrap added on file/diff contents.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1020 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/wiki_content.rb

@@ -60,6 +60,14 @@ class WikiContent < ActiveRecord::Base
         data
       end      
     end
+    
+    # Returns the previous version or nil
+    def previous
+      @previous ||= WikiContent::Version.find(:first, 
+                                              :order => 'version DESC',
+                                              :include => :author,
+                                              :conditions => ["wiki_content_id = ? AND version < ?", wiki_content_id, version])
+    end
   end
   
 end