ncurses 5.9 - patch 20150523

ncurses 5.9 - patch 20150523

+ add 'P' menu item to test/ncurses.c, to show pad in color.
+ improve discussion in curs_color.3x about color rendering (prompted
  by comment on Stack Overflow forum):
+ remove screen-bce.mlterm, since mlterm does not do "bce" -TD
+ add several screen.XXX entries to support the respective variations
  for 256 colors -TD
+ add putty+fnkeys* building-block entries -TD
+ add smkx/rmkx to capabilities analyzed with infocmp "-i" option.