Bug 15548: Move new patron related code to Patron*

Bug 15548: Move new patron related code to Patron*

The 'borrower' should not be used anymore, especially for new code.
This patch move files and rename variables newly pushed (i.e. in the Koha
namespace).

Test plan:
1/
  git grep Koha::Borrower
should not return code in use.

2/
Prove the different modified test files

3/ Do some clicks in the member^Wpatron module to be sure there is not
an obvious error.

Signed-off-by: Hector Castro <hector.hecaxmmx@gmail.com>
Works as described. Tested with Circulation, Members/Patrons, Discharge,
Restrictions modules and the must common functionalities

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Jesse Weaver <jweaver@bywatersolutions.com>