Added support for copying the outputs of the analysis in an AliEn folder from a

Added support for copying the outputs of the analysis in an AliEn folder from a
PROOF job. One has just to supply a valid path to an Alien location to the method:
   AliAnalysisManager->SetSpecialOutputLocation(path); where:
path = "alien:///alice/cern.ch/user/.../myOutput/" has to be prefixed by alien://
and must correspond to the user token that started the proof job. The common
output files (AOD) will be copied to this location as AliAOD_n.root from each
slave (n) while the rest of the outputs (histograms) will be first merged then
copied to the same location.