Bug 15163: Do not erase patron attributes if limited to another library

Bug 15163: Do not erase patron attributes if limited to another library

The patron attributes displayed on editing a patron are not displayed if
limited to another library.

C4::Members::Attributes::SetBorrowerAttributes will now only delete attributes
the librarian is editing.
SetBorrowerAttributes takes a new $no_branch_limit parameter. If set,
the branch limitations have not effect and all attributes are deleted
(same behavior as before this patch).

Test plan:
1/ Create 2 patron attributes, without branch limitations.
2/ Edit a patron and set a value for these attributes
3/ Limit a patron attributes to a library (one you are not logged in
with).
4/ Edit again the patron.
=> You should not see the limited attributes
5/ Edit the patron attributes and remove the branch limitation
=> Without this patch, it has been removed from the database and is not
displayed anymore.
=> With this patch, you should see it.

Signed-off-by: Jesse Weaver <jweaver@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Brendan Gallagher brendan@bywatersolutions.com