Bug 18403: Adapt patron search

Bug 18403: Adapt patron search

This patch modifies the patron search code to limit the libraries to the
ones
the logged in user is allowed to access

Test plan:
Search for patrons
You should not see patrons you are not allowed to see.

Technical note:
I am really glad to have refactored all the patron searches before
having to
write this patch. It tooks me ~40 l to acchieve this job and affect all
patron searches.
Thanks refactoring!

Signed-off-by: Signed-off-by: Jon McGowan <jon.mcgowan@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>