ncurses 5.6 - patch 20080621

ncurses 5.6 - patch 20080621

+ regenerated html documentation.
+ expand manpage description of parameters for form_driver() and
  menu_driver() (prompted by discussion with Adam Spragg).
+ add null-pointer checks for cur_term in baudrate() and
  def_shell_mode(), def_prog_mode()
+ fix some memory leaks in delscreen() and wide acs.