DPatientLookup.cs: Usings Cleanup
DApptSearch: Extensive refactoring. Now uses new algorithm to find appointments. Now outputs CGAvailability
CGView: Appointments checked in now set the Checkin time on the appointment structure; changes to support DApptSearch modified output.
CGSchedLib: Extensive refactoring; only 2 methods remain: CreateAppointmentSchedule and CreateAvailabilitySchedule
CGDocument: SlotsAvailable uses a new algorithm
CGAVView: Uses CalendarGrid.TimesOverlap instead of the removed one in CGSchedLib
CGAVDocument: Uses CalendarGrid.TimesOverlap instead of the removed one in CGSchedLib; CreateAssignedSlotSchedule reassigned to CreateAvailabilitySchedule