ability to duplicate a transaction + manual upload from external source

[mdelpire]

Hello,

1. Abitlity to duplicate a single transaction. If several transactions are selected, it is not possible. this useful for recurring transaction (like monthly payment)
2. allow a manual upload from an external source. For instance if I have a scanner that can scan to a folder on the network, I can push the invoice directly to the manual upload folder and process it by clicking on the button on the top left corner. This is only available in selfhosted mode.