Added appointment creation functionality

Forms added: AppointmentEntry, PatientSelectionList, DoctorSelectionList
Classes added: Appointment, VisitQuery
Classes modified: Staff, StaffQuery

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Not yet working:
Transferring patient ID and doctor ID from their respective browse
pages onto the AppointmentEntry form while keeping the windows active

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Additional note:
Appointment time will contain the date and time of appointment, no need
for separate columns in the VISITS table. May consider dropping the
appointment_date column.
Merge branch 'master' of https://github.com/nugrakbari/Genetech

Conflicts:
	Project2Assignment 2 3-2 4/src/project2assignment/StaffQuery.java