Bug 28386: Sort authors by lastname || firstname

Bug 28386: Sort authors by lastname || firstname

If several authors have the same lastname, they are swapped in the list between the different runs.

This is reusing the code from the release_tools, see issue #24

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 3e8b14aa8e07703c5e3d8a42b6431352e3883f68)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit adb61b53d361859b1b910d697ac4970c4c0c66b9)
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>