Make tests pass again (minor glitches).

Tests/Controller/Elements/ItemsTest.cs

@@ -182,6 +182,7 @@ namespace Tests.Controller.Elements
         [Test]
         public void ItemCommentWithoutHandler()
         {
+            CommentPool.Default.Reset();
             Laboratory lab = new Laboratory();
             TimePoint tp = new TimePoint();
             tp.TimeStamp = new DateTime(2015, 7, 13, 13, 31, 00);