Due to changes in Quiz which allows commenting and manual grading of all question types, essay no longer needs its two tables: question_essay and question_essay_states

backuplib.php removed backup code related to question_essay_states
type/essay/db/mysql.sql and postgres7.sql removed all SQL
type/essay/display.html improved essay display
type/essay/questiontype.php, editquestion.php, and editquestion.html removed all uses
of the two tables - this resulted in a great simplification of the essay question type