REFAC: Replaced unsigned char bare pointer by QSharePointer< unsigned char > in VectorImageModel and ImageModelRenderer.

ENH: Added release rasterized buffer in VectorImageModel::ReleaseMemory; Added some constructor initializations.

ENH: Connected Vector-image to Dataset PropertiesUpdated signal; Fixed bug in DatasetDescriptor::SetImageModelProperties(); Saved no-data fields updates in descriptor XML.

ENH: Optimized GDAL overview support (generated only when importing image); Registered new dataset-model into database-model when importing new image-file.

ENH: Initialization of rendering-settings when reloading dataset/vector-image/quicklook models; Considering BuildContext of vector-image when building quicklook-model during reloading.

ENH: Improved VectorImageModel::Settings interface; Optimzzed modified and applied flags of ::Settings (not setting flag when not needed).

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

ENH: Improved VectorImageModel::Settings to keep track of modified and applied flag (replacing old dirty flag); Cought MainWindow::closeEvent() and displated confirm save/discard/cancel dialog.

ENH: (experimental) Changing RGB for BGRA buffers, as advertised to be more efficient and mainstream for OpenGl drivers in several OpenGl ressources

ENH: Moved generated quicklook image-file into dataset directory; Added DatasetModel::GetDirectory() accessor; Added QuicklookModel::GetImageModel<>() accessors; Added VectorImageModel::GetDatasetModel() accessor; Remove unnecessary typedefs in QuicklookModel.h.

      - slot to extract index from the coordinate widget in the status

        * Settings will be needed
        * ToImage is defined in VectorImage
     - Implement the Index/Physical coordinates/Radiometry/latlong pixel description