adding more links to courses and selecting which users to see

rowers/templates/mapcompare.html

@@ -19,6 +19,18 @@
 
 <h1>Course Map Comparison</h1>
 
+<p>
+  <form method="GET">
+    {% for competitor in competitors %}
+    {% if competitor in selected_users %}
+    <input type="checkbox" name="users" value="{{ competitor.id|encode }}" checked>{{ competitor }}<br>
+    {% else %}
+    <input type="checkbox" name="users" value="{{ competitor.id|encode }}">{{ competitor }}<br>
+    {% endif %}
+    {% endfor %}
+    <input type="submit" value="Submit">
+  </form>
+</p>
 <p>Click on a line to see the label. Double click on a line to remove it. Reload to get back all lines.</p>
 <p>We show your original GPS coordinates on the course. For course time, we use a finer interpolation, to get
   the exact time when you crossed the line.</p>