Wiki page hierarchy (#528). Parent page can be assigned on Rename screen.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1698 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/fixtures/wiki_pages.yml

@@ -4,23 +4,27 @@ wiki_pages_001:
   title: CookBook_documentation
   id: 1
   wiki_id: 1
-  protected: true  
+  protected: true
+  parent_id: 
 wiki_pages_002: 
   created_on: 2007-03-08 00:18:07 +01:00
   title: Another_page
   id: 2
   wiki_id: 1
   protected: false
+  parent_id: 
 wiki_pages_003: 
   created_on: 2007-03-08 00:18:07 +01:00
   title: Start_page
   id: 3
   wiki_id: 2
   protected: false
+  parent_id: 
 wiki_pages_004: 
   created_on: 2007-03-08 00:18:07 +01:00
   title: Page_with_an_inline_image
   id: 4
   wiki_id: 1
   protected: false
+  parent_id: 1