TeX and CSS tweaks.

Sync with latest Instiki Trunk
(Updates Rails to 1.2.2)

vendor/rails/railties/lib/console_sandbox.rb

@@ -1,6 +1,6 @@
-ActiveRecord::Base.lock_mutex
+ActiveRecord::Base.send :increment_open_transactions
 ActiveRecord::Base.connection.begin_db_transaction
 at_exit do
   ActiveRecord::Base.connection.rollback_db_transaction
-  ActiveRecord::Base.unlock_mutex
+  ActiveRecord::Base.send :decrement_open_transactions
 end