When enabling warnings as errors apparently some test functions were just outcommented. The test still run and show that they succeed, but actually they don't test anything. This happend in commit 8cb6d1660ca8a05804477d757a830da509a5344e

affected IGT test classes are:

1. mitkNavigationDataRecorderTest::TestLoadingRecordedXMLFile()
2. all functions in mitkNavigationDataTest
3. mitkNavigationToolStorageSerializerAndDeserializerTest::TestReadZipFileWithNoToolStorage()
4. mitkTrackingDeviceSouceConfiguratorTest::TestNDIAuroraTrackingDevice() and

mitkTrackingDeviceSouceConfiguratorTest::TestNDIPolarisTrackingDevice()