Removing the ma: prefix in the ontology document
++++++++++++++++++++++++++++++++++++++++++++++++

* search ' ma:' and add italic around the ontology term where it is missing
  (only a few occurrences)
* replace all occurrences of 'ma:' by ''
* fix false positives in the replacement above:

  * replace 'scheebu' by 'schema:ebu' (EBUCore mapping table)
  * replace '<genre' by '<ma:hasGenre' (POWDER example)
  * replace '<publisher' by '<ma:hasPublisher' (POWDER example)
  * replace '> hasGenre' by '> ma:hasGenre' (twice, in RDF ontology) 

NB: the API document does not contain the 'ma:' string