Merging of output files via TFileMerger

• Naimplementovat macro na zlievanie histogramov cez TFileMerger class
• Funckia bude primat nasledovne parametre void Merge(TString filename = "inputHisto.txt", TString output = "outAll.root")
• Kazdy si urobi merge request so svoim username (stalcite trojuholnicek pre gombiku Create merge request a v mene branchu dodate -username, eg. -mvala)