ncurses 6.4 - patch 20230408

ncurses 6.4 - patch 20230408

+ document limitations of tparm, and error-returns in curs_terminfo.3x
+ document limitations of tgoto, and error-returns in curs_termcap.3x
+ add xterm+focus to alacritty+common (patch by Christian Duerr).
+ add "-v" option to tput, to show warnings.
> improve checks for malformed terminfo data (report/analysis by
  Jonathan Bar Or, Michael Pearse, Emanuele Cozzi).
  + make the parameter type/count checks in _nc_tiparm() more stringent
  + update tgoto() to account for _nc_tiparm() changes
  + add checks in tparm() and tiparm() for misuse of string parameters
  + add special cases in tput to handle extensions Cs/Ms parameters
  + ignore compiled-terminfo where the array sizes exceed the standard