TODO
* Remove the need to create a copy of the template data
  at worst only have a copy of the BinXML
** remove libfwevt_template_get_data

* Rename _read() functions to _read_data()
** libfwevt_manifest_read
** libfwevt_template_read
** libfwevt_xml_document_read

* Expose libfwevt_xml_tag_free

20140928
* see `git log' for more recent change log
* Created stand-alone version of version used in libevt

