* Some additional clean-up
* Changed the way the vCard is generated
  I wanted a central point, where vcard data is assembled.
  That data is later used by the template for hCard display and by the vCard builder to generate the vCard for download
* hook_theme update
  Changed a few days ago
* Removed the theme_vcard()
  From my point of view it's redundant, as we have a template file now.
* Added template_preprocess_vcard()
  To have the variables prepared outside the template file
* Cleaned up the template file

- Extended and slightly formatted the help page.
- A bugfix for a typo in 'organisation/org
- Extra paranoia about the add-on library - the link was showing up when the card was unavailable.