Bug 19029: Add JavaScript security question for cloning circ rules

Bug 19029: Add JavaScript security question for cloning circ rules

This patch introduces a Javascript security question which is displayed
to the user when they try to clone a circulation rule to a specific
branch when the rule is a 'Standard rule for all libraries"

The rationale for this patch is when the cloning takes place it
overwrites the existing rules of the destination branch and there is no
notification of this to the user. Therefore by implementing this patch
the user is asked if they want to clone the rule (if the rule is
standard accross all libraries) and are told that it
will overwrite the rules in the destination branch.

Test plan:
1. Create a circulation rule for all libraries

2. Make sure the 'select a library' option is set to 'Standard rules for all
libraries"

3. Click the 'Clone' button and notice that the cloning takes place
without any warning that it will overwrite the rules of the destination
branch

4. Apply patch

5. Return to the circulation and fine rules page

6. Repeat step 2

7. Click the clone button and notice a alert box appears asking if you
are sure you want to clone the standard rule to the destination branch.

Note: The name of the destination branch is included in the alert.
Also note that the user is informed of the consequences of performing
the action, i.e. that it will overwrite the existing rules in the
destination branch

8. Click 'Cancel' and notice that no cloning occurs

9. Click the clone button again and this time click 'OK' and notice
that the cloning takes place

10. Return to the Circulation and fine rules page and set the 'Select a
library' option to the name of an individual branch

11. Click the clone button and notice that the clone action takes place

Sponsored-By: Catalyst IT
Signed-off-by: David Bourgault <david.bourgault@inlibro.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>