fix bug in :ray, which is patched in jskgeo.l
fix bug in :ray, which is patched in jskgeo.l

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