[enh] improve yacy engine
[enh] improve yacy engine

kdani3/searx,dalf/searx,jibe-b/searx,gugod/searx,potato/searx,asciimoo/searx,framasoft/searx,jpope777/searx,misnyo/searx,potato/searx,potato/searx,pointhi/searx,misnyo/searx,dzc34/searx,matejc/searx,jcherqui/searx,GreenLunar/searx,jpope777/searx,kdani3/searx,GreenLunar/searx,matejc/searx,dalf/searx,matejc/searx,asciimoo/searx,framasoft/searx,asciimoo/searx,GreenLunar/searx,framasoft/searx,framasoft/searx,jibe-b/searx,dalf/searx,matejc/searx,jcherqui/searx,jibe-b/searx,misnyo/searx,asciimoo/searx,dalf/searx,jcherqui/searx,pointhi/searx,kdani3/searx,jpope777/searx,misnyo/searx,dzc34/searx,PwnArt1st/searx,jpope777/searx,GreenLunar/searx,jcherqui/searx,gugod/searx,pointhi/searx,dzc34/searx,gugod/searx,PwnArt1st/searx,kdani3/searx,PwnArt1st/searx,dzc34/searx,jibe-b/searx,PwnArt1st/searx,gugod/searx,potato/searx,pointhi/searx