ncurses 6.0 - patch 20171014

ncurses 6.0 - patch 20171014

+ minor cleanup to test/view.c:
  + eliminate "-n" option by simply reading the whole file.
  + implement page up/down commands.
+ add check in tput for init/reset operands to ensure those use a
  terminal.
+ improve manual pages which discuss chtype, cchar_t types and the
  attribute values which can be stored in those types.
+ correct array-index when parsing "-T" command-line option in tabs
  program.
+ modify demo_new_pair.c to pass extended pairs to setcchar().
+ add test/dots_xcurses.c to illustrate a different approach used for
  extended colors which can be contrasted with dots_curses.c.
+ add a check in tic to note when a description uses non-mandatory
  delays without xon_xoff.  This is not an error, but some descriptions
  for a terminal emulator may use the combination incorrectly.