Matrix question

Matrix question type.
Matrix question type. Adds support for k’ grading as well as a streamlined user interface.
This question type allows the teacher to define the rows and columns that make up a matrix. Students can select either multiple or single answers per row, depending on how the question has been configured. Each row receives a grade defined by one of the grading methods. The final grade for the question is an average of their grades for each of the rows.