clean flag in svp reduction now based on length of first vector
clean flag in svp reduction now based on length of first vector

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