delete, edit, search, display staff

"admin/staffs.php"
backend-staff
Tidy up back-end
Back-end for Presentation 3

links plus pagination, search and sort for back-end pages
stafflogin fixed and permission display
course selection form pagination
Merge remote-tracking branch 'origin/mele'

Conflicts:
	Documentations/reference.txt
	Web App/Images/_notes/dwsync.xml
	Web App/Style/_notes/dwsync.xml
	Web App/_class/_notes/dwsync.xml
	Web App/_class/database.php
	Web App/admin/staff_home.php
	Web App/admin/stafflogin.php
	Web App/admin/students.php
	Web App/bea/_class/backdb.php
	Web App/bea/_class/frontdb.php
	Web App/bea/admin/_notes/dwsync.xml
	Web App/bea/admin/addcourse.php
	Web App/bea/admin/editcourse.php
	Web App/bea/admin/editstaff.php
	Web App/bea/admin/stafflogin.php
	Web App/bea/admin/students.php
	Web App/bea/cart.php
	Web App/mele/_class/_notes/dwsync.xml

merging
merge using -Xtheirs