Upgrade to Rails 2.0.2

Upgraded to Rails 2.0.2, except that we maintain

   vendor/rails/actionpack/lib/action_controller/routing.rb

from Rail 1.2.6 (at least for now), so that Routes don't change. We still
get to enjoy Rails's many new features.

Also fixed a bug in Chunk-handling: disable WikiWord processing in tags (for real this time).

vendor/rails/railties/lib/console_with_helpers.rb

@@ -10,8 +10,10 @@ class Module
   end
 end
 
-def helper
-  @helper_proxy ||= Object.new 
+def helper(*helper_names)
+  returning @helper_proxy ||= Object.new do |helper|
+    helper_names.each { |h| helper.extend "#{h}_helper".classify.constantize }
+  end
 end
 
 require 'application'
@@ -21,3 +23,4 @@ class << helper
 end
 
 @controller = ApplicationController.new
+helper :application rescue nil