Implement automatic terminal-local environment variables via `local-environment-varia...

Implement automatic terminal-local environment variables via `local-environment-variables'.

* lisp/env.el (setenv, getenv): Add optional terminal parameter.  Update docs.
  (setenv): Handle `local-environment-variables'.
  (read-envvar-name): Also allow (and complete) local
  environment variables on the current terminal.

* src/callproc.c: Include frame.h and termhooks.h, for terminal parameters.
  (Qenvironment): New constant.
  (Vlocal_environment_variables): New variable.
  (syms_of_callproc): Register and initialize them.
  (child_setup): Handle Vlocal_environment_variables.
  (getenv_internal): Add terminal parameter.  Handle
  Vlocal_environment_variables.
  (Fgetenv_internal): Add terminal parameter.

* src/termhooks.h (get_terminal_param): Declare.

* src/Makefile.in (callproc.o): Update dependencies.
* mac/makefile.MPW (callproc.c.x): Update dependencies.

* lisp/termdev.el (terminal-id): Make parameter optional.
  (terminal-getenv, terminal-setenv, with-terminal-environment):
  Disable functions.

* lisp/mule-cmds.el (set-locale-environment): Convert `terminal-getenv' calls
  to `getenv'.
* lisp/rxvt.el (rxvt-set-background-mode): Ditto.
* lisp/x-win.el (x-initialize-window-system): Ditto.
* lisp/xterm.el (terminal-init-xterm): Ditto.

* lisp/server.el (server-process-filter): Fix reference to the 'display frame
  parameter.

git-archimport-id: lorentey@elte.hu--2004/emacs--multi-tty--0--patch-461