* emacs/guix-config.el.in (guix-emacs-interface-directory,
guix-state-directory): Rename to ...
(guix-config-emacs-interface-directory, guix-config-state-directory):
...this.
(guix-config-guile-program): New constant.
(guix-guile-program): Move to ...
* emacs/guix-external.el (guix-guile-program): ...here. Make it a
'defcustom'.
* emacs/guix-profiles.el (guix-default-profile): Use
'guix-config-state-directory'.
* emacs/guix-backend.el (guix-load-path): Use
'guix-config-emacs-interface-directory'.
Suggested by Ludovic Courtès <ludo@gnu.org>.
* configure.ac: Set DOT_USER_PROGRAM variable.
* emacs/guix-config.el.in (guix-config-dot-program): New constant.
* emacs/guix-external.el (guix-dot-program): Use it.
Suggested by Ludovic Courtès <ludo@gnu.org>.
* emacs/guix-external.el (guix-png-file-name): Change prefix of a file
name to "guix-emacs-graph-" to avoid possible conflicts.
