Bug 8130 - attach PDF files to a patron record

Bug 8130 - attach PDF files to a patron record

Adds the ability to attach unlimited arbitrary files to
a borrower record.

Test Plan:
1) Enable system preference EnableBorrowerFiles
2) Look up borrower record, click 'Files' tab on left
3) Upload a file, download the file, delete the file.

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
rebased for current master.

Signed-off-by: Ian Walls <koha.sekjal@gmail.com>
rebased again; some indentation issues in include menus.