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Patch for "15.04_STABLE" branch: https://reviews.mahara.org/6175

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https://bugs.launchpad.net/bugs/1558387

Title:
  Use $CFG->cacheversion for HTMLPurifier revision number

Status in Mahara:
  Fix Committed
Status in Mahara 1.10 series:
  In Progress
Status in Mahara 15.04 series:
  In Progress
Status in Mahara 15.10 series:
  In Progress
Status in Mahara 16.04 series:
  Fix Committed

Bug description:
  As is the recommended practice, Mahara caches the computed form of its
  HTMLPurifier rules, for performance. We have in place in clean_html()
  a setting for "HTML.DefinitionID", with a comment that says that the
  developer should increment that number if they make changes to the
  HTML Purifier definition. But in the past we have *not* done that, and
  instead manually deleted the htmlpurifier cache directory from the
  dataroot.

  It occurs to me that it would be simpler to set HTML.DefinitionRev to
  "get_config('cacheversion')", so that it will be automatically cleared
  whenever the Mahara system version changes. The a dev just needs to
  bump version.php to make the HTMLPurifier cache get cleared.

  This will cause the cache to be cleared more frequently than it needs
  to be (we rarely make changes to our HTMLPurifier configuration), but
  only once per Mahara upgrade, so that's still not too bad.

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