ncurses 5.9 - patch 20120428

ncurses 5.9 - patch 20120428

+ fix some inconsistencies between vt320/vt420, e.g., cnorm/civis -TD
+ add eslok flag to dec+sl -TD
+ dec+sl applies to vt320 and up -TD
+ drop wsl width from xterm+sl -TD
+ reuse xterm+sl in putty and nsca-m -TD
+ add ansi+tabs to vt520 -TD
+ add ansi+enq to vt220-vt520 -TD
+ fix a compiler warning in example in ncurses-intro.doc (Paul Waring).
+ added paragraph in keyname manpage telling how extended capabilities
  are interpreted as key definitions.
+ modify tic's check of conflicting key definitions to include extended
  capability strings in addition to the existing check on predefined
  keys.