For a usual profile, packages are placed in a profile directory itself,
but for a system profile, packages are placed in 'profile'
sub-directory. So we need to do some special cases for system profiles
to find packages there as well.
* emacs/guix-base.el (guix-packages-profile): New procedure.
(guix-manifest-file): Use it. Add optional 'system?' argument.
* emacs/guix-ui-generation.el (guix-system-generation?)
(guix-generation-current-packages-profile): New procedures.
(guix-generation-packages, guix-generation-insert-packages): Remove
'generation' argument.
(guix-generation-packages-buffer): Add optional 'system?' argument.
(guix-profile-generation-manifest-file)
(guix-profile-generation-packages-buffer): Adjust accordingly.
* emacs/guix-main.scm (generation-package-specifications+paths): Rename to...
(profile->specifications+paths): ... this. Use a single 'profile' argument.
2df17bd0ee