add feature to remove duplicates

rowers/templates/workout_duplicates_select.html

@@ -0,0 +1,50 @@
+{% extends "newbase.html" %}
+{% load static %}
+{% load rowerfilters %}
+
+{% block title %}Workouts{% endblock %}
+
+{% block main %}
+<script>
+  function toggle(source) {
+  checkboxes = document.querySelectorAll("input[name='workouts']");
+  for(var i=0, n=checkboxes.length;i<n;i++) {
+       checkboxes[i].checked = source.checked;
+  }
+ }
+</script>
+
+<h1>{{ team.name }} Select Duplicate Workouts</h1>
+
+<ul class="main-content">
+  <li class="grid_4">
+    <p>
+      The workouts in the list are duplicate workouts. They are overlapping in time with other
+      workouts you have performed. They are not used in analysis or statistics. With the
+      form below you can select any number of duplicate workouts and remove them
+      permanently. This action is not reversible.
+    </p>
+      {% if workouts %}
+      <form enctype="multipart/form-data" method="post">
+        {% csrf_token %}
+        <input type="checkbox" onClick="toggle(this)" /> Toggle All<br/>
+
+        <table width="100%" class="listtable">
+          {{ form.as_table }}
+        </table>
+        <input name='workoutselectform' type="submit" value="Remove Selected">
+      </form>
+      {% else %}
+      <p> No workouts found </p>
+      {% endif %}
+</li>
+</ul>
+
+
+{% endblock %}
+
+
+
+{% block sidebar %}
+{% include 'menu_workouts.html' %}
+{% endblock %}