Split bill card

0.8.3.1Sort members by state and name.Send notice message to unpaid members only.If event is already noticed state, send notice message by email to recipients as BCC.minor bug fixes.0.7.6.1Fixed some minor bugs.0.7.6.0Support negative number on payment for some special case like support from dues.0.7.5.1Fix minor bug on unexpected process termination.0.7.5Correct start/end date of event automatically when user modified event's start/end time and start time is later than end time.