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Version 3.3.5

- fixed: latest versions of PSTricks break the cropping of text figures.
- fixed: arious problems of axes rendering
- fixed: shapes were grouped after having loaded a drawing
- fixed: same attributes of axes were not saved in SVG documents
- fixed: colours were not generated when shapes are grouped
- fixed: incorrect message was displayed when an export failed

- improvement: the code insertion dialogue box provides better feedback on LaTeX errors
- improvement: buttons added to the error panel to clean the errors and send them by email