message: Allow compilation without AliEn
diff: #include "AliOfflineTrigger.h"
  #include "AliSysInfo.h"
  #include "TTimeStamp.h"
  +#ifdef WITHALIEN
  #include "TAlienCollection.h"
  +#endif
  #include "TPRegexp.h"
  using std::cout;
  using std::endl;
  @@ -639,15 +641,20 @@ void AliOfflineTrigger::ExtractSelected(const char *rawList, const char * trig
  */
  TObjArray* rawArray = 0;
  if (TPRegexp(".xml$").Match(rawList)){
  +#ifdef WITHALIEN
  TAlienCollection *coll = (TAlienCollection *)TAlienCollection::Open(rawList);
  Int_t nFiles = coll->GetNofGroups();
  rawArray=new TObjArray(nFiles);
  while( coll->Next()){
  rawArray->AddLast(new TObjString(coll->GetTURL()));
  }
  +#endif
  }else{
  rawArray = gSystem->GetFromPipe(TString::Format("cat %s", rawList)).Tokenize("\n");
  }
  + if (rawArray == 0) {
  + ::Error("AliOfflineTrigger::ExtractSelected","No AliEn support compiled-in");
  + }
  Int_t nFiles=rawArray->GetEntries();
  if (nFiles<=0){
  ::Error("AliOfflineTrigger::ExtractSelected","Empty input list");
  