Allow full XHTML

Hi,

As Drupal has its own filtering mechanism, I think TinyMCE should be configured to not do any filtering, like

  valid_elements : "*[*]"

Alternatively, the full XHTML rule set could be used, ref. valid_elements. By default TinyMCE works with a reduced rule set, which can lead to unexpected behaviour such as /node/51097.

Thanks,
Bastiaan.