- Add method ZYpp::getTarget that returns the Target or a NULL pointer,

- Add method ZYpp::getTarget that returns the Target or a NULL pointer,
  if it is not yet initialized. This is to avoid try/catch blocks just
  to test whether the Target is initialized. (bnc #417556)
- Add method Target::assertRootPrefix. Pass a pathname and get back the
  path prefixed with the tragets root, unless it already had that prefix.