Bug 4985: Edit a calendar entry for all branches

Bug 4985: Edit a calendar entry for all branches

This patch adds functionality to calendar tool to
make edits or deletes to all branches at once.

To test:
-Apply patch
-Add holiday for a library and copy it to all or some
libraries
-Edit previosly made holiday (edit, delete etc.) and
check out "Copy changes to all libraries." checkbox
=> Changes are made to all libraries sharing changed
holiday

Sponsored by: Koha-Suomi Oy

Signed-off-by: Christofer <christofer.zorn@ajaxlibrary.ca>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Sally <sally.healey@cheshiresharedservices.gov.uk>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit ce2219425d9b97952f5904024fb7575a0809487b)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
(cherry picked from commit 6f85f47365a1460d1e68280835d69008424fea45)

Signed-off-by: Aleisha Amohia <aleishaamohia@hotmail.com>
(cherry picked from commit dbb2717123362bf620184f3ac548d90918d6c1ce)
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>