Fixes #272 missing md5sum

* dashboard: add warning if missing checksums
* add a "compute all missing md5sum" option in batch manager (inspired by delete orphans)
* progress bar when computing md5sums

admin.php

@@ -251,6 +251,18 @@ if ($nb_photos_in_caddie > 0)
     );
 }
 
+// any photos with no md5sum ?
+$nb_no_md5sum =  count(get_photos_no_md5sum());
+if ($nb_no_md5sum > 0)
+{
+  $template->assign(
+    array(
+      'NB_NO_MD5SUM' => $nb_no_md5sum,
+      'U_NO_MD5SUM' => $link_start.'batch_manager&filter=prefilter-no_sync_md5sum',
+    )
+  );
+}
+
 // any orphan photo?
 $nb_orphans = count(get_orphans());