Reimplement and extend support for terminal-local environment variables.

Reimplement and extend support for terminal-local environment variables.

* lisp/termdev.el: New file.  Move terminal parameter-related functions
  here from frame.el.
  (terminal-getenv, with-terminal-environment): Reimplement and extend.
  (terminal-setenv, terminal-setenv-internal): New functions.

* lisp/frame.el (make-frame-on-tty, framep-on-display, suspend-frame):
  Extend doc string, update parameter names.
  (terminal-id, terminal-parameter-alist, terminal-parameters)
  (terminal-parameter-p, terminal-parameter, set-terminal-parameter)
  (terminal-handle-delete-frame, terminal-getenv, terminal-getenv)
  (with-terminal-environment): Move to termdev.el.

* lisp/loadup.el: Load termdev as well.
* lisp/Makefile.in (lisp, shortlisp): Add termdev.elc.
* lisp/makefile.MPW (shortlisp): Ditto.

* lisp/ebuff-menu.el (electric-buffer-menu-mode-map): Bind C-z to
  `suspend-frame', not `suspend-emacs'.
* lisp/echistory.el (electric-history-map): Ditto.
* lisp/ebrowse.el (ebrowse-electric-list-mode-map): Ditto.
* lisp/ebrowse.el (ebrowse-electric-position-mode-map): Ditto.

* lisp/startup.el (normal-splash-screen): Use `save-buffers-kill-display'
  instead of `save-buffers-kill-emacs'.

* lisp/x-win.el (x-initialize-window-system): Add 'global-ok option to
  `terminal-getenv'.

* src/term.c (suspend-tty): Update doc string.

git-archimport-id: lorentey@elte.hu--2004/emacs--multi-tty--0--patch-456