this release changes:
- feature: added keyboard shortcuts "Ctrl+1..6" to switch between the different pens
- feature: added coordinate system builders (thanks to @Kneemund )
- feature: drop text on the canvas
- improvement: export preferences, new export dialogs and options
- improvement: UI following Gnome HIG more closely ( with @bertob's help )
- fix: update current document state when the file was modified from the workspace browser. (thanks @Kneemund )
- fix: clearing text attributes for new text fields