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CHANGES
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Make the onlinehelp utility more component oriented.

- Use registred page/view instead of ViewPageTemplate for rendering topic tree
  This way we can use/register own templates for tree layout.

- Add page template based topic for rendering topics which has to 
  call other zope3 resources like javascripts and css styles sheets etc. 
  This resources can be rendered in the header area of the onlinehelp_macros.

- Enhance the API of topics and simplyfie the view part.

- Implemented getSubTopics() method on topics. This way we can sublist topics.
  
- Remove unused onlinehelp code in rotterdam template.pt

- Add type to directive, this supports registration of README.txt as 'rest' topics
