GitLab

* README:
* configure.ac:
* nt/README.W32:
* msdos/sed2v2.inp:
* src/msdos.c (internal_terminal_init):
* etc/refcards/ru-refcard.tex:
* etc/NEWS: Bump Emacs version to 29.0.50.
* etc/NEWS.28: New file.

* lisp/cus-edit.el (customize-changed-options-previous-release):
Update the reference version of Emacs.