disable adding histograms to directory also for root merging
disable adding histograms to directory also for root merging

ALICEHLT/AliRoot,alisw/AliRoot,sebaleh/AliRoot,miranov25/AliRoot,sebaleh/AliRoot,ALICEHLT/AliRoot,sebaleh/AliRoot,miranov25/AliRoot,ALICEHLT/AliRoot,coppedis/AliRoot,ALICEHLT/AliRoot,miranov25/AliRoot,alisw/AliRoot,coppedis/AliRoot,sebaleh/AliRoot,shahor02/AliRoot,coppedis/AliRoot,miranov25/AliRoot,miranov25/AliRoot,sebaleh/AliRoot,shahor02/AliRoot,alisw/AliRoot,alisw/AliRoot,shahor02/AliRoot,ALICEHLT/AliRoot,shahor02/AliRoot,alisw/AliRoot,miranov25/AliRoot,sebaleh/AliRoot,shahor02/AliRoot,coppedis/AliRoot,coppedis/AliRoot,alisw/AliRoot,alisw/AliRoot,sebaleh/AliRoot,ALICEHLT/AliRoot,miranov25/AliRoot,alisw/AliRoot,coppedis/AliRoot,ALICEHLT/AliRoot,shahor02/AliRoot,miranov25/AliRoot,coppedis/AliRoot,shahor02/AliRoot,coppedis/AliRoot