endofcluster pages are not displayed anymore, shortanswer wrong answers are interpret...

endofcluster pages are not displayed anymore, shortanswer wrong answers are interpreted correctly, added user answer tracking to attempts so it can be used later by report.php, essays are no longer insterted into an essay table... now kept in the useranswer field in attempts, fixed a problem with grading numerical questions, modified to work with modattempts option, fixed a problem with grading matching questions and fixed addpage so that it displays multichoice with the multianswer option