Changed error messages so that ones from geturl that are not obviously from geturl are prefixed by `geturl: '.
Changed error messages so that ones from geturl that are not obviously from
geturl are prefixed by `geturl: '.


OPENDAP/libdap4,OPENDAP/libdap4,OPENDAP/libdap4,OPENDAP/libdap4,OPENDAP/libdap,OPENDAP/libdap4,OPENDAP/libdap,OPENDAP/libdap,OPENDAP/libdap,OPENDAP/libdap4