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

db/migrate/095_add_wiki_pages_parent_id.rb

@@ -0,0 +1,9 @@
+class AddWikiPagesParentId < ActiveRecord::Migration
+  def self.up
+    add_column :wiki_pages, :parent_id, :integer, :default => nil
+  end
+
+  def self.down
+    remove_column :wiki_pages, :parent_id
+  end
+end