ncurses 5.9 - patch 20120421

ncurses 5.9 - patch 20120421

+ improve cleanup of temporary files in tic using atexit().
+ add msgr to vt420, similar DEC vtXXX entries -TD
+ add several missing vt420 capabilities from vt220 -TD
+ factor out ansi+pp from several entries -TD
+ change xterm+sl and xterm+sl-twm to include only the status-line
  capabilities and not "use=xterm", making them more generally useful
  as building-blocks -TD
+ add dec+sl building block, as example -TD
+ add XT to some terminfo entries to improve usefulness for other
  applications than screen, which would like to pretend that xterm's
  title is a status-line.  -TD
+ change use-clauses in ansi-mtabs, hp2626, and hp2622 based on review
  of ordering and overrides -TD