Merge branch '0.9.x' into refactor-api

Merge branch '0.9.x' into refactor-api

* 0.9.x:
  change DB so OpenIDPlugin manages OpenID tables
  Some bug fixes
  check the schema
  add some more methods to Schema
  Added hook for Aside container
  Revert "Outputting UTF-8 charset in document header irrespective of mimetype."
  FOAF for Groups.
  use schema tool to create a table
  statusize schema-related modules
  test script for schema code
  make table def method of schema code work
  start a module for schema management