Fix timetable auto-extend parent by start_dt
Fix timetable auto-extend parent by start_dt

mic4ael/indico,OmeGak/indico,DirkHoffmann/indico,OmeGak/indico,ThiefMaster/indico,ThiefMaster/indico,mic4ael/indico,DirkHoffmann/indico,indico/indico,indico/indico,pferreir/indico,DirkHoffmann/indico,indico/indico,pferreir/indico,pferreir/indico,mic4ael/indico,pferreir/indico,mic4ael/indico,mvidalgarcia/indico,DirkHoffmann/indico,mvidalgarcia/indico,indico/indico,ThiefMaster/indico,OmeGak/indico,ThiefMaster/indico,OmeGak/indico,mvidalgarcia/indico,mvidalgarcia/indico