Bug 18403: Add new method Koha::Patron->can_see_patron_info

Bug 18403: Add new method Koha::Patron->can_see_patron_info

Technical note:
This is the method that will be called on the logged_in_user variable sent to
the template. Moreover we will check that the logged in user can access patron'
information when access to members/* and some circulation scripts will be done.

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