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/rails_generator/scripts/destroy.rb

@@ -3,5 +3,28 @@ require File.dirname(__FILE__) + '/../scripts'
 module Rails::Generator::Scripts
   class Destroy < Base
     mandatory_options :command => :destroy
+    
+    protected
+    def usage_message
+      usage = "\nInstalled Generators\n"
+      Rails::Generator::Base.sources.each do |source|
+        label = source.label.to_s.capitalize
+        names = source.names
+        usage << "  #{label}: #{names.join(', ')}\n" unless names.empty?
+      end
+
+      usage << <<end_blurb
+
+This script will destroy all files created by the corresponding 
+script/generate command. For instance, script/destroy migration CreatePost
+will delete the appropriate ###_create_post.rb file in db/migrate, while 
+script/destroy scaffold Post will delete the posts controller and 
+views, post model and migration, all associated tests, and the map.resources
+:posts line in config/routes.rb.
+      
+For instructions on finding new generators, run script/generate
+end_blurb
+      return usage
+    end
   end
 end