Copy to function in receipts and payments

[AJD]

Read this thread and you will see why it makes sense.

Convert a Payment to a Receipt and Vice Versa

We used to have this feature. The programming improved the database design by changing from payments and receipts being in the same table to payments in one table and receipts in another table. This meant that the code to convert receipts and payments to each other had to go away. However, I hope @lubos will consider reimplementing. The conversion need would be fulfilled even if some data is lost in the conversion due to some columns not having a corresponding column in the other table. Some u…