Bug 28490: Revert "Bug 26995: Drop column relationship from borrowers, deletedborrowe...

Bug 28490: Revert "Bug 26995: Drop column relationship from borrowers, deletedborrowers and borrower_modifications tables"

This reverts commit ca0e7541ecdff13ada9ba8ffbd992c963959d30f.

It was part of a patch set that removed actively used data and must be
therefore reverted.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Petro Vashchuk <stalkernoid@gmail.com>
Signed-off-by: Emmi Takkinen <emmi.takkinen@koha-suomi.fi>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>