Allow the site admin to upload watermark images. Can't do much with them yet.

modules/watermark/views/admin_watermarks.html.php

@@ -0,0 +1,10 @@
+<? defined("SYSPATH") or die("No direct script access."); ?>
+<ul class="gWatermarks">
+  <? foreach ($watermarks as $watermark): ?>
+  <li>
+    <img <?= photo::img_dimensions($watermark->width, $watermark->height, 72) ?> src="<?= url::file("var/modules/watermark/$watermark->name") ?>">
+  </li>
+  <? endforeach ?>
+</ul>
+
+<?= $form ?>