made submit button name dynamic and added cancel button to form
added sessions to admin
switched from custom monthyear widget to two normal select dropdowns and added referrer in session
made costentry form hidden by default (through collapse)
fixed error in costentry form if value is empty
auto extend collapse for cost entry form if form errors
added sorting for cost entries
added new char field "date_sortable", overwrote save method in model and changed filter in view to just show upcoming cost entries
split costentries in view by onetime and recurring
added blank=True to costentry model because of failing form validation