Extract headings and TOC parsing from the textile formatter.

Fixes #2038 and #3707 and will allow to support TOC with other text formatters.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4376 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/unit/lib/redmine/wiki_formatting/macros_test.rb

@@ -20,6 +20,9 @@ require File.dirname(__FILE__) + '/../../../../test_helper'
 class Redmine::WikiFormatting::MacrosTest < HelperTestCase
   include ApplicationHelper
   include ActionView::Helpers::TextHelper
+  include ActionView::Helpers::SanitizeHelper
+  extend ActionView::Helpers::SanitizeHelper::ClassMethods
+  
   fixtures :projects, :roles, :enabled_modules, :users,
                       :repositories, :changesets, 
                       :trackers, :issue_statuses, :issues,