Add numbering to course students (#78)

- Explicitly order names by first name, in case of a last name conflict
(**EDIT: Removed from PR**)
- The way to sort stuff in cases of identical values is not in the SQL
specification, so we can't rely on that sorting a specific way.
- Adds a counter to the names (see below)


![image](https://github.com/user-attachments/assets/80fbf70d-f018-4605-8bbc-b87a32d1169e)

tin/templates/assignments/show.html

@@ -115,6 +115,7 @@ <h2 style="border-top:1px solid lightgray;padding-top:15px;">Filter Submissions<
       {% if assignment.is_quiz %}
         <table id="submission-list" class="has-border">
           <tr>
+            <th style="min-width:20px"></th>
             <th style="min-width:125px">Student</th>
             {% if not active_period.name %}
               <th style="min-width:65px;">Period</th>
@@ -127,6 +128,7 @@ <h2 style="border-top:1px solid lightgray;padding-top:15px;">Filter Submissions<
           </tr>
           {% for student, period, latest_submission, graded_submission, ended, quiz_issues in students_and_submissions %}
             <tr>
+              <td style="text-align: center">{{ forloop.counter }}</tr>
               <td><a href="{% url 'assignments:student_submission' assignment.id student.id %}">{{ student.full_name }}
                 ({{ student.username }})</a></td>
               {% if not active_period.name %}
@@ -155,6 +157,7 @@ <h2 style="border-top:1px solid lightgray;padding-top:15px;">Filter Submissions<
       {% else %}
         <table id="submission-list" class="has-border">
           <tr>
+            <th style="min-width:20px"></th>
             <th style="min-width:125px">Student</th>
             {% if not active_period.name %}
               <th style="min-width:65px;">Period</th>
@@ -168,6 +171,7 @@ <h2 style="border-top:1px solid lightgray;padding-top:15px;">Filter Submissions<
           </tr>
           {% for student, period, latest_submission, graded_submission, new_login, new_24 in students_and_submissions %}
             <tr>
+              <td style="text-align:center">{{ forloop.counter }}</td>
               <td><a href="{% url 'assignments:student_submission' assignment.id student.id %}">{{ student.full_name }}
                 ({{ student.username }})</a></td>
               {% if not active_period.name %}