fix some issue affecting using python on Ubuntu 14.04

Author: ThomasRuf

eventdisplay/FairEventManager.h

@@ -36,6 +36,7 @@ class FairEventManager : public TEveEventManager
     virtual void DisplaySettings();       //  *Menu*
     virtual Int_t Color(Int_t pdg);
     void AddTask(FairTask* t) {fRunAna->AddTask(t);}
+    FairRootManager* GetFairRootManager(){  return fRootManager ;};
     virtual void Init( Int_t visopt = 1, Int_t vislvl = 3, Int_t maxvisnds = 10000);
     virtual Int_t GetCurrentEvent() {return fEntry;}
     virtual void SetPriOnly(Bool_t Pri) {fPriOnly=Pri;}

eventdisplay/FairEventManagerEditor.cxx

@@ -55,8 +55,9 @@ FairEventManagerEditor::FairEventManagerEditor(const TGWindow* p, Int_t width, I
 
 void FairEventManagerEditor::Init()
 {
-
-  FairRootManager* fRootManager=FairRootManager::Instance();
+  FairRootManager* fRootManager=fManager->GetFairRootManager();
+  if (fRootManager==0){return;};
+  if (fRootManager==0){fRootManager=new FairRootManager();};
   TChain* chain =fRootManager->GetInChain();
   Int_t Entries= chain->GetEntriesFast();
 
@@ -65,10 +66,10 @@ void FairEventManagerEditor::Init()
   TGCompositeFrame* title1 = new TGCompositeFrame(fInfoFrame, 250, 10,
       kVerticalFrame | kLHintsExpandX |
       kFixedWidth    | kOwnBackground);
-
+ 
   TString Infile= "Input file : ";
 //  TFile* file =FairRunAna::Instance()->GetInputFile();
-  TFile* file =FairRootManager::Instance()->GetInChain()->GetFile();
+  TFile* file =fRootManager->GetInChain()->GetFile();
   Infile+=file->GetName();
   TGLabel* TFName=new TGLabel(title1, Infile.Data());
   title1->AddFrame(TFName);
@@ -186,7 +187,7 @@ void FairEventManagerEditor::SelectEvent()
 
   TString time;
 // time+=(FairRootManager::Instance()->GetEventTime());
-  time.Form("%.2f", FairRootManager::Instance()->GetEventTime());
+  time.Form("%.2f", fManager->GetFairRootManager()->GetEventTime());
   time += " ns";
   fEventTime->SetText(time.Data());