Fix computation of mean in autoAbort
Fix computation of mean in autoAbort

blowfish880/fplll,fplll/fplll,fplll/fplll,gbonnoron/fplll,gbonnoron/fplll,malb/fplll,pfasante/fplll,fplll/fplll,gbonnoron/fplll,pfasante/fplll,dstehle/fplll,shi-bai/fplll,blowfish880/fplll,GottfriedHerold/fplll,shi-bai/fplll,shi-bai/fplll,GottfriedHerold/fplll,blowfish880/fplll,cr-marcstevens/fplll,fplll/fplll,fplll/fplll,dstehle/fplll,malb/fplll,pfasante/fplll,dstehle/fplll,malb/fplll,cr-marcstevens/fplll,cr-marcstevens/fplll,GottfriedHerold/fplll,shi-bai/fplll,cr-marcstevens/fplll