ncurses 6.0 - patch 20161231

ncurses 6.0 - patch 20161231

+ fix errata for ncurses-howto (report by Damien Ruscoe).
+ fix a few places in configure/build scripts where DESTDIR and rpath
  were combined (report by Thomas Klausner).
+ merge current st description (report by Harry Gindi) -TD
+ modify flash capability for linux and wyse entries to put the delay
  between the reverse/normal escapes rather than after -TD
+ modify program tabs to pass the actual tty file descriptor to
  setupterm rather than the standard output, making padding work
  consistently.
+ explain in clear's manual page that it writes to stdout.
+ add special case for verbose debugging traces of command-line
  utilities which write to stderr (cf: 20161126).
+ remove a trace with literal escapes from skip_DECSCNM(), added in
  20161203.
+ update config.guess, config.sub from
	http://git.savannah.gnu.org/cgit/config.git