ncurses 5.7 - patch 20090919

+ document return code from define_key (report by Mike Gran).
+ make some symbolic links in the terminfo directory-tree shorter
  (patch by Daniel Jacobowitz, forwarded by Sven Joachim).).
+ fix some groff warnings in terminfo.5, etc., from recent Debian
  changes.
+ change ncv and op capabilities in sun-color terminfo entry to match
  Sun's entry for this (report by Laszlo Peter).
+ improve interix smso terminfo capability by using reverse rather than
  bold (report by Kristof Zelechovski).