[BUG #8677] TabBar pages are widgets and supports the exclude methods
[BUG #8618] Migrate qx.test.util.DateFormat  to mocha
[BUG #8618] Declare _parseFeed as protected to enable better testability
[BUG #8618] Stub getGroupSeparator and getDecimalSeparator to refloat NumberFormat tests. Resolve hard dependency to qx.locale.Number
[BUG #8618] Formatting tests