ncurses 6.0 - patch 20171118

+ add a note to curs_addch.3x on portability.
+ add a note to curs_pad.3x on the origin and portability of pads.
+ improve manpage description of getattrs (report by Midolikawa H).
+ improve manpage macros (prompted by discussion in Debian #880551.
+ reviewed test-programs using KEY_RESIZE, made fixes to test/worm.c
+ add a "-d" option to picsmap for default-colors.
+ modify old terminology entry and a few other terminal emulators to
  account for xon -TD
+ correct sgr string for tmux, which used screen's "standout" code
  rather than the standard code (patch by Roman Kagan)
+ correct sgr/sgr0 strings in a few other cases reported by tic, making
  those correspond to the non-sgr settings where they differ, but
  otherwise use ECMA-48 consistently:
  jaixterm, aixterm, att5420_2, att4424, att500, decansi, d410-7b,
  dm80, hpterm, emu-220, hp2, iTerm2.app, mterm-ansi, ncrvt100an,
  st-0.7, vi603, vwmterm -TD
+ build-fix for diagnostics warning in lib_mouse.c for pre-5.0 versions
  of gcc which did not recognize the diagnostic "push" pragma (patch by
  Vassili Courzakis).