[FIX] Statistics Date Range on Old Events
[FIX] Statistics Date Range on Old Events

* Refactored date range propagation:
* If today is after the conference end, use the latter
* Start date of range is set by default days before end-date

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