History: External Wiki Handler

            Handler to register external wikis as part of the profiles.

{CODE(caption=>YAML)}
objects:
 -
  type: extwiki
  data:
   name: doc
   url: "http://doc.tiki.org/$page"
{CODE}

! External Wiki Object Parameters

||__Field name__|__Mandatory__|__Description__
name|y|External wiki shorthand
url|y|URL for the remote wiki page, using $page as a placeholder
||