Task #944

Updated by Serge Heiden about 5 years ago

- discuss about sharing the chart export and data export systems
- share a method to create a default valid file name (see method cleanFileName() in charts engine) when exporting some results
- add the format types in export dialog boxes, not only the extension file, ex. Type : "SVG (.svg)", (*.svg)", etc. (following LibreOffice "save as..." policy)