BibCirculation: several fixes

• Fixed adding and deleting notes for a loan.

• In function loan_on_desk, a new borrower was created (even if the borrower already existed), using the same name but adding quotes. Now fixed.

• Cleaned up function calls that produced exceptions (unexpected arguments).

• After a loan is performed, the loans list was displayed, but a refresh was needed to see this last loan.

• Fixed weird behaviour in 'notes' 'Back' buttons.