Bug 6943: Added ability to duplicate a budget tree (from the edit sub menu)

Bug 6943: Added ability to duplicate a budget tree (from the edit sub menu)

http://bugs.koha-community.org/show_bug.cgi?id=6943
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
- all new javascript alerts have translations markers _()
- hierarchies and permissions were copied correctly

Possible enhancements:
- make it possible to move orders from old to new funds
- make it possible to change description while copying, saving 1 additional
step

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>