* subr.el (user-emacs-directory): New defconst.

* subr.el (user-emacs-directory): New defconst.
* cmuscheme.el (scheme-start-file): Use user-emacs-directory.
* shell.el (shell): Use user-emacs-directory.
* completion.el (save-completions-file-name): Use
user-emacs-directory.
* custom.el (custom-theme-directory): Use user-emacs-directory.
* term/x-win.el (emacs-session-filename): Use
user-emacs-directory.
* filesets.el (filesets-menu-cache-file): Use
user-emacs-directory.
* thumbs.el (thumbs-thumbsdir): Use user-emacs-directory.
* server.el (server-auth-dir): Use user-emacs-directory.
* image-dired.el (image-dired-dir): Use user-emacs-directory.
(image-dired-db-file): Likewise.
(image-dired-temp-image-file): Likewise.
(image-dired-gallery-dir): Likewise.
(image-dired-temp-rotate-image-file): Likewise.
* play/gamegrid.el (gamegrid-user-score-file-directory): Use
user-emacs-directory.
* savehist.el (savehist-file): Use user-emacs-directory.
* tutorial.el (tutorial--saved-dir): Use user-emacs-directory.
* startup.el (auto-save-list-file-prefix): Use
user-emacs-directory.