added Posted Billings menu
added new page for report of individual posted billings
added search form for individual event posted billings
change the title of Membership Generated Billings page
added file for the view of individual posted billings
added function displayIndividualPostedBilings
display individual posted billings
added function searchPostedBillings
implement search function for individual event posted billings
added function searchPostedBillingsByDate
implement function searchPostedBillingsByDate
remove new membership billing search