Add macro to get start and end timestamps of runs
Add macro to get start and end timestamps of runs

- This is useful for O2 analysis scheme of CCDB object retrieval

coppedis/AliRoot,miranov25/AliRoot,miranov25/AliRoot,coppedis/AliRoot,alisw/AliRoot,coppedis/AliRoot,coppedis/AliRoot,alisw/AliRoot,coppedis/AliRoot,coppedis/AliRoot,coppedis/AliRoot,alisw/AliRoot,miranov25/AliRoot,miranov25/AliRoot,alisw/AliRoot,alisw/AliRoot,coppedis/AliRoot,miranov25/AliRoot,alisw/AliRoot,alisw/AliRoot,miranov25/AliRoot,alisw/AliRoot,miranov25/AliRoot,miranov25/AliRoot