add :arrow-scale argument to configure scaling of tip of arrow
add :arrow-scale argument to configure scaling of tip of arrow

wkentaro/EusLisp,bmagyar/EusLisp,bmagyar/EusLisp,bmagyar/EusLisp,wkentaro/EusLisp,wkentaro/EusLisp,aginika/EusLisp,bmagyar/EusLisp,wkentaro/EusLisp,aginika/EusLisp,aginika/EusLisp,aginika/EusLisp