add update-handlers to select overwrite signal handler and error handler
add update-handlers to select overwrite signal handler and error handler

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