1) In normal TBasket constructor mother directory assigned to TBranch directory.
2) In TBasket::CopyTo method file for copy is used directly without setting gFile/gDirectory
3) In TBasket::WriteBuffer mother dir assigned once again. It is required when basket with
   default constructor was created.


git-svn-id: http://root.cern.ch/svn/root/trunk@13914 27541ba8-7e3a-0410-8455-c3a389f83636