Prevent from some PHP5 warnings (ref args, no :: object init)

Prevent from some PHP5 warnings (ref args, no :: object init)
  php5 runs now through, just one wrong XmlElement object init missing
Removed unneccesary UpgradeUser lines
Changed WikiLink to omit version if current (RecentChanges)

git-svn-id: svn://svn.code.sf.net/p/phpwiki/code/trunk@3336 96ab9672-09ca-45d6-a79d-3d69d39ca109