Show list of all questions under "Settings"

Just as we now show rates under Basic Info, for example. Advantages:

• Easy to change questions in bulk (list-edit).

• Easy to add, duplicate, delete, import, export questions.

• When importing: Be able to link queries to an operation, receipt type, customer.

• Move questions from, for example, operation level to receipt type level.

• Filter quickly on questions.

• Show in a separate tab the receipts to which the question is linked with the completed answers.