Fix for various html5 to cnxml templates.
Fix for various html5 to cnxml templates.

Generalizes the namespaces, fixes the namespaces in the document header,
tweaks various tags to work correctly, and reverse several of the data-*
attribute transforms.

Connexions/rhaptos.cnxmlutils,Connexions/rhaptos.cnxmlutils,Connexions/rhaptos.cnxmlutils,Connexions/rhaptos.cnxmlutils,Connexions/rhaptos.cnxmlutils