[PATCH 0/7]: Add "M-x guix-licenses" and friends.

[Alex Kost]

Hello, this patchset adds the following emacs commands:

- guix-browse-license-url
- guix-packages-by-license
- guix-licenses

Patches:

[PATCH 1/7] emacs: Rename 'file-path' to 'file-name'.

  Actually this patch is independent from the rest patchset, I just
  added it for the company.

[PATCH 2/7] licenses: Add a list of licenses.
[PATCH 3/7] emacs: Add 'guix-browse-license-url' command.
[PATCH 4/7] emacs: Buttonize licenses in "Package Info".
[PATCH 5/7] emacs: Add 'guix-packages-by-license' command.
[PATCH 6/7] emacs: list: Support displaying URL links.
[PATCH 7/7] emacs: Add interface for licenses.