- added option --force-bootstrap in combination with --recycle-root
  in the kiwi modes --prepare and/or --create. When using a base
  tree with --recycle-root kiwi normally skips the bootstrapping
  part because that data should all be part of the base tree. If
  the tree is not complete in this regard, e.g missing zypper one
  can now enforce the bootstrapping phase to be called.
- make the methods of the XML data base class public
  + brings code into allignment with other OO use in other langauges
  + the base class nature is indicated by the name