optional "Link copies to the template" toggle, default off (v0.3.1)

Template/recurrence/edit.php

@@ -34,6 +34,11 @@
     <?= $this->form->label(t('Create the copy this many days before the due date'), 'recoreco_days_before') ?>
     <input type="number" name="recoreco_days_before" min="0" value="<?= $this->text->e($values['recoreco_days_before']) ?>">
 
+    <?= $this->form->checkbox('recoreco_link_copies', t('Link copies to the template'), 1, $values['recoreco_link_copies'] == 1) ?>
+    <p class="form-help">
+        <?= t('When on, the template keeps a link to each copy -- a running count and one-click navigation to every one. Off by default; best left off for frequent (daily/weekly) schedules to avoid piling up links.') ?>
+    </p>
+
 
     <?= $this->modal->submitButtons() ?>
 </form>