Change default REFLECT error to something more informative
Change default REFLECT error to something more informative

See http://issue.cc/r3/1859 for details.

draegtun/ren-c,draegtun/ren-c,kealist/ren-c,kealist/ren-c,codebybrett/ren-c,rgchris/ren-c,draegtun/ren-c,giuliolunati/ren-c,rgchris/ren-c,codebybrett/ren-c,giuliolunati/ren-c,codebybrett/ren-c,giuliolunati/ren-c,draegtun/ren-c,rebolsource/r3,codebybrett/ren-c,codebybrett/ren-c,mbk/ren-c,kealist/ren-c,draegtun/ren-c,hostilefork/rebol,giuliolunati/ren-c,rgchris/ren-c,hostilefork/rebol,draegtun/ren-c,rgchris/ren-c,kealist/ren-c,mbk/ren-c,hostilefork/rebol,rebolsource/r3,hostilefork/rebol,mbk/ren-c,rebolsource/r3,giuliolunati/ren-c,kealist/ren-c,hostilefork/rebol,kealist/ren-c,hostilefork/rebol,codebybrett/ren-c,mbk/ren-c,rgchris/ren-c