Restore build using gcc-4.8.3 / Qt-4.8.6 / kdelibs-4.14.9 :

umbrello/umldoc.cpp
- In function saveDocument at logError2 calls "could not upload file"
  replace argument url.toString() by url.pathOrUrl().

umbrello/import_argo.cpp
- In functions reportError, loadFromArgoFile, loadFromTodoFile, at
  logError3 / logDebug3 calls replace argument xml.name() by
  xml.name().toString().

umbrello/uml.cpp
- In function logInfo avoid use of qInfo() (not available in Qt4).