course can be updated
Revert "course can be updated"

This reverts commit 6c33d999dcf5f34c2d05f7a2439363a56cc3bd4b.
added Head of department module verification funadfctions
session protection. Please see course_view and other course module for an  example which I implements it there.
Merge origin/master

Conflicts:
	NetBeansProjects/Training Management System/web/course_delete.jsp
	NetBeansProjects/Training Management System/web/course_edit.jsp
	NetBeansProjects/Training Management System/web/course_new.jsp
	NetBeansProjects/Training Management System/web/course_view.jsp