Merge branch 'bug-15480-add-savebasedata-in-ioutil'
- bug-15480-add-savebasedata-in-ioutil: Added simple test case for mitk::IOUtil::SaveBaseDate(). Fixed handling of base file names and extensions. Added a SaveBaseData(mitk::BaseData*,...) method to IOUtil. Make the mitk::ImageWriter inherit from mitk::FileWriterWithInformation.