* emacs/guix-location.el (guix-find-location): Make interactive. Adjust to handle "reduced" locations (without line and column numbers).
* emacs/guix-base.el (guix-directory, guix-read-directory) (guix-set-directory): Move to "guix-backend.el". (guix-find-location, guix-package-location, guix-edit): Move to... * emacs/guix-location.el: ... here. New file. * emacs/guix-ui-package.el: Use it. * emacs.am (ELFILES): Add it.