require payment for split fees

I initially tried the splitting feature, but the court was booked as long as 1 person paid.  It became too much of an admin hassle to have each of the other players to pay at the time of arrival, so we removed this option (although our players would like it).

Still an issue, would like to be able to configure the amount of time the other members have to confirm the payment before it cancels.  Eg, 4 hours. 

At least with the check in scanner if does flag those with a balance owing.