Revision 38347

  In TProofLite:
  - Fix problem with passing the 'varexp' and 'selection' strings for processing, preventing
    correct usage of the operators '|' and '||' in TTreeFormula.
    Should fix issue reported at http://root.cern.ch/phpBB3/viewtopic.php?t=11559 .
  - Make sure that the required dataset is registered when such optio is specified in TProofOutputFile