Code cleanup

- Format code accordingly to coding conventions
- Add / update PHPDoc all over the place
- Suppress most of the warnings that did not have a big impact on code's logic

core/dbobjectsearch.class.php

@@ -954,6 +954,9 @@ class DBObjectSearch extends DBSearch
 		}
 	}
 
+	/**
+	 * @inheritDoc
+	 */
 	public function Intersect(DBSearch $oFilter)
 	{
 		if ($oFilter instanceof DBUnionSearch)