Uses new data format where the payment type is explicit instead of inferred from its column.
Adds mentino of email command and removes emailing as a result of adding payment.
Adds serialize method to Payment and User.
Actually add payment to payments.csv.
Adds a 'value' function to the Payment model to deal with paypal value weirdness.
Adds summary when displaying filtered payments.
Cleans up user summary.
Totals when looking at payments are of the full amount given, not the amount counted againist the user's total.
Adds info command to show a useful summary of a user and their payments.
Improves payment printout.
Moves finding user by partial name or nick out for resuse.
Adding payment with partial name now possible, warns when it matches more than one user.
Seperates payments from donations attributed to a user.