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/commands/servers/base.rb

@@ -17,3 +17,15 @@ def tail(log_file)
   end
   tail_thread
 end
+
+def start_debugger
+  begin
+    require_library_or_gem 'ruby-debug'
+    Debugger.start
+    Debugger.settings[:autoeval] = true if Debugger.respond_to?(:settings)
+    puts "=> Debugger enabled"
+  rescue Exception
+    puts "You need to install ruby-debug to run the server in debugging mode. With gems, use 'gem install ruby-debug'"
+    exit
+  end
+end