Whether splitting the dinner bill, chipping in on gas, or settling up any other kind of debt, everyone needs to pay their fair share. However, fewer and fewer are carrying cash these days. That’s OK, though, because a number of apps can make transferring money to another person easy. Square Cash is about as easy as it gets when it comes to sending money. There’s no need to even set up an account. It’s as simple as one person sending an email to another. Link a debit card and money transfers instantly to the recipient’s bank. Credit cards can be used, too, though there is a small fee. And Square…