modified mix evaluation results for instructors

Like the student's mix evaluation results view, it no longer make
sense to use Section 1 and Section 2 to separate the text and Likert
questions because the actual evaluation form doesn't use sections
anymore. The evaluation results now uses the element mixval_details.
The only difference between the instructor's and student's view is
that the evaluator's name is printed for the instructor while the
answers are shown anonymously.
made a small addition to the mix eval results for instructors

Included the addition of the colour blue to evaluator's name that
no longer belongs to the group. This feature was in the previous
mix evaluation results, but was left out when the new format
was implemented.

I've also removed a few functions that were used by mix evaluation
results but no longer used including getPoints, renderQuestionResult,
getMixevalResultTable, and getResultTableHeader from the
evaluation helper.
filtered out evaluation_mixeval details from submitters that

have not submitted yet for mix evaluations.

I have also fixed a bug for evaluation results in the element
mixeval_details for likert questions. scale_level is no longer
used, so instead I counted the number of descriptors.
fixed broken tests for GetResultsByEvaluatee by including

the new parameter