Add (guix elf).
* guix/elf.scm: New file. Taken from Guile 'master', commit 3f826e3.
* Makefile.am (MODULES): Add it.
* THANKS: Thank Andy, who wrote this module.
doc: Improve acknowledgments.
* doc/guix.texi (Acknowledgments): Expound a bit.
* THANKS: Mention artwork; thank Felipe & Nikita.
Merge branch 'master' into core-updates
Merge branch 'master' into core-updates
Merge branch 'master' into core-updates
Update AUTHORS and THANKS.
Merge branch 'master' into core-updates
Update 'THANKS'.
* THANKS: Correct the email address I use for Guix work.
Merge branch 'master' into core-updates