removed unused variables

core/API/DocumentationGenerator.php

core/API/ResponseBuilder.php

core/CronArchive.php

core/DataAccess/LogAggregator.php

core/DataArray.php

core/DataTable.php

core/DataTable/Filter/ColumnCallbackAddColumnQuotient.php

core/DataTable/Filter/ColumnCallbackReplace.php

core/DataTable/Filter/ReplaceColumnNames.php

core/DataTable/Map.php

core/DataTable/Renderer/Rss.php

core/DataTable/Renderer/Xml.php

core/FrontController.php

core/IP.php

core/SegmentExpression.php

core/Tracker.php

core/View/UIControl.php