Implemented taxonomy administration pages

- create term, vocabulary, add or remove term from vocabularies, ...
Fixed content editing related to taxonomy  (especially with multiple terms vs tags).
Fixed various SQL storage issue related to taxonomy and vocabularies.
Added CMS_RESPONSE.wsf_theme as helper.

examples/demo/site/modules/taxonomy/files/css/taxonomy.css

@@ -19,3 +19,8 @@ ul.taxonomy li:hover {
   border-bottom: solid 1px #66f;
   background-color: #ddf;
 }
+
+table.taxonomy td {
+  border: solid 1px #ccc;
+  padding: 2px;
+}

examples/demo/site/modules/taxonomy/files/scss/taxonomy.scss

@@ -19,3 +19,9 @@ ul.taxonomy {
 		}
 	}
 }
+table.taxonomy {
+	td {
+		border: solid 1px #ccc;
+		padding: 2px;
+	}
+}