('?' from the Reading Messages prompt) would not fully display because
it contains a Ctrl-Z character (for the right-arrow symbol). Rather than
revert the menu() change (where CPM-EOF mode is the default for menu
files) - change the Ctrl-AZ sequence from "premature end-of-file" to instead
send an actual Ctrl-Z character (similiar to Ctrl-AA, Ctrl-AL, etc.). This
changes the long-standing behavior of what Ctrl-AZ does, but since that was
a dubious "feature" that I'm pretty sure nobody used, I'm will to take that
chance. If you need a premature EOF now, just use a regular ole Ctrl-Z
char instead (or even the @eof@ code). Of course the msgscan.asc now has
to change accordingly.