+20200606
+ + add xterm+256color2, xterm+88color2, to deprecate nonstandard usage
+ in xterm+256color, xterm+88color -TD
+ + add shifted Linux console keys in linux+sfkeys entry for
+ screen.linux (report by Alexandre Montaron).
+ + use vt100+enq in screen (report by Alexandre Montaron).
+ + add screen.linux-s alias (suggested by Alexandre Montaron).
+