ncurses 5.6 - patch 20080203

+ modify _nc_setupscreen() to set the legacy-coding value the same
  for both narrow/wide models.  It had been set only for wide model,
  but is needed to make unctrl() work with locale in the narrow model.
+ improve waddch() and winsch() handling of EILSEQ from mbrtowc() by
  using unctrl() to display illegal bytes rather than trying to append
  further bytes to make up a valid sequence (reported by Andrey A
  Chernov).
+ modify unctrl() to check codes in 128-255 range versus isprint().
  If they are not printable, and locale was set, use a "M-" or "~"
  sequence.
+ improve threading in test/worm.c (wrap refresh calls, and KEY_RESIZE
  handling).  Now it hangs in napms(), no matter whether nanosleep()
  or poll() or select() are used on Linux.