ncurses 6.0 - patch 20170617

ncurses 6.0 - patch 20170617

+ fill in some places where TERMTYPE2 vs TERMTYPE was not used
  (report by Allen Hewes).
+ use ExitTerminfo() internally in error-exits for ncurses' setupterm
  to help with leak checking.
+ use ExitProgram() in error-exit from initscr() to help with leak
  checking.
+ review test-programs, adding checks for cases where the terminal
  cannot be initialized.