ENH: Added AbstractModel::IsModified(); Tested IsModified() when closing window/quitting application.

COMP: Added QtXml dependency. ENH: Added DatasetDescriptor ::Read() and ::Write() methods; Written empty DatasetDescriptor when creating empty dataset on disk; Enhanced SystemError (added ::GetErrorCode() method); Fixed I18nAplication::MakeCacheDir().

ENH: Added I18nApplication::Instance<>() and ::ConstInstance<>() methods; Create Dataset directory into Application::CacheDir().

ENH: Moved instanciation of DatasetModel from MainWindow::on_action_Open_activated() to Application::LoadDatasetModel(); Parametrized AbstractModel::BuildModel() with generic (void*) context; Created dataset directory when importing image file.

ENH: Upgraded AbstractModelController to disable/enable  controller widget when there is (no) model.

ENH: Linked update of OpenGL view when changing color-setup (still buggy); replaced dynamic_cast by quickier qobject_cast when dealing with QObjects.

ENH: Connected selected model changed (on file load); Setup of band names from VectorImageModel to ColorSetupWidget (TODO: GetBandNames() returns an empty string vector).

REFAC: Changed order of includes (ConfigureMonteverdi2.h before Qt before other includes to prevent system compilation problems).

ENH: Implemented basic version of Model (AbstractModel<-AbstractImageModel->VectorImageModel); loading on File/Open and storing in Application.

REFAC: Moved i18n part of mvdApplication into mvdI18nApplication base-class for viewer and manager applications.

TRANS: First t:ry merging (MERGE_TS:BOOL=ON) translations.

ENH: Testing QT_VERSION>=4.8.0 before calling QLocale::script() (compatibility with builds on Windows and Mac OS plateforms).