ncurses 6.0 - patch 20161022

ncurses 6.0 - patch 20161022

+ modify tset -w (and tput reset) to update the program's copy of the
  screensize if it was already set in the system, to improve tabstop
  setting which relies upon knowing the actual screensize.
+ add functionality of tset -w to tput, like the "-c" feature this is
  not optional in tput.
+ add "clear" as a possible link/alias to tput.
+ improve tput's check for being called as "init" or "reset" to allow
  for transformed names.
+ split-out the "clear" function from progs/clear.c, share with
  tput to get the same behavior, e.g., the E3 extension.